--- a/layout/reftests/selection/reftest.list
+++ b/layout/reftests/selection/reftest.list
@@ -43,11 +43,11 @@ fuzzy-if(OSX==1010,9,1) fuzzy-if(OSX&&sk
 == invalidation-1e.html invalidation-1-ref.html
 == invalidation-1f.html invalidation-1-ref.html
 == invalidation-2a.html invalidation-2-ref.html
 == invalidation-2b.html invalidation-2-ref.html
 == invalidation-2c.html invalidation-2-ref.html
 == invalidation-2d.html invalidation-2-ref.html
 == invalidation-2e.html invalidation-2-ref.html
 == invalidation-2f.html invalidation-2-ref.html
-fuzzy(7,2) fuzzy-if(OSX,1,1) fails-if(/^Windows\x20NT\x2010\.0/.test(http.oscpu)&&isDebugBuild&&!browserIsRemote) fails-if(Android) needs-focus == rtl-selection-with-decoration.html rtl-selection-with-decoration-ref.html
-fails-if(/^Windows\x20NT\x2010\.0/.test(http.oscpu)&&isDebugBuild&&!browserIsRemote) fails-if(Android) needs-focus == semitransparent-decoration-line.html semitransparent-decoration-line-ref.html
-fuzzy-if(OSX,1,6) fails-if(/^Windows\x20NT\x2010\.0/.test(http.oscpu)&&isDebugBuild&&!browserIsRemote) fails-if(Android) needs-focus == writing-mode.html writing-mode-ref.html
+fuzzy(7,2) fuzzy-if(OSX,1,1) fails-if(isDebugBuild&&!browserIsRemote) fails-if(Android) needs-focus == rtl-selection-with-decoration.html rtl-selection-with-decoration-ref.html
+fails-if(isDebugBuild&&!browserIsRemote) fails-if(Android) needs-focus == semitransparent-decoration-line.html semitransparent-decoration-line-ref.html
+fuzzy-if(OSX,1,6) fails-if(isDebugBuild&&!browserIsRemote) fails-if(Android) needs-focus == writing-mode.html writing-mode-ref.html

--- a/taskcluster/ci/test/mochitest.yml
+++ b/taskcluster/ci/test/mochitest.yml
@@ -41,17 +41,17 @@ mochitest:
             linux.*/debug: 16
             linux64-asan/opt: 10
             linux64-.*cov/opt: 10
             windows10-64-ccov/debug: 10
             default: 5
     e10s:
         by-test-platform:
             linux64-jsdcov/opt: false
-            windows7-32/debug: both
+            linux32/debug: both
             default: true
     max-run-time:
         by-test-platform:
             android-4.3-arm7-api-16/debug: 7200
             default: 5400
     allow-software-gl-layers: false
     tier:
         by-test-platform:
@@ -97,17 +97,16 @@ mochitest-browser-chrome:
     chunks:
         by-test-platform:
             linux.*/debug: 16
             linux64-asan/opt: 16
             default: 7
     e10s:
         by-test-platform:
             linux64-jsdcov/opt: false
-            windows7-32/debug: both
             default: true
     max-run-time:
         by-test-platform:
             linux64-.*cov/opt: 7200
             windows10-64-ccov/debug: 7200
             linux.*/debug: 5400
             default: 3600
     mozharness:
@@ -196,17 +195,17 @@ mochitest-chrome:
 mochitest-clipboard:
     description: "Mochitest clipboard run"
     suite: mochitest/clipboard
     treeherder-symbol: M(cl)
     loopback-video: true
     instance-size: xlarge
     e10s:
         by-test-platform:
-            windows7-32/debug: both
+            linux32/debug: both
             default: true
     mozharness:
         mochitest-flavor: plain
         config:
             by-test-platform:
                 macosx.*:
                     - remove_executables.py
         extra-options:
@@ -229,17 +228,16 @@ mochitest-devtools-chrome:
             default: mochitest/mochitest-devtools-chrome-chunked
     treeherder-symbol: M(dt)
     loopback-video: true
     max-run-time: 5400
     chunks: 8
     e10s:
         by-test-platform:
             linux64-jsdcov/opt: false
-            windows7-32/debug: both
             default: true
     mozharness:
         mochitest-flavor: chrome
         chunked: true
     instance-size:
         by-test-platform:
             linux64-asan/opt: xlarge  # runs out of memory on default/m3.large
             default: default
@@ -261,17 +259,17 @@ mochitest-gpu:
     loopback-video: true
     instance-size:
         by-test-platform:
             android.*: xlarge
             default: default
     virtualization: virtual-with-gpu
     e10s:
         by-test-platform:
-            windows7-32/debug: both
+            linux32/debug: both
             default: true
     mozharness:
         mochitest-flavor: plain
         extra-options:
             by-test-platform:
                 android.*:
                     # note that Android runs fewer suites than other platforms
                     - --test-suite=mochitest-plain-gpu
@@ -367,17 +365,17 @@ mochitest-webgl:
     virtualization: virtual-with-gpu
     chunks:
         by-test-platform:
             android.*: 10
             windows.*: 8
             default: 3
     e10s:
         by-test-platform:
-            windows7-32/debug: both
+            linux32/debug: both
             default: true
     loopback-video: true
     max-run-time:
         by-test-platform:
             windows.*: 5400
             android.*: 7200
             default: 3600
     instance-size:

--- a/taskcluster/ci/test/reftest.yml
+++ b/taskcluster/ci/test/reftest.yml
@@ -36,17 +36,17 @@ crashtest:
             default: virtual
     chunks:
         by-test-platform:
             android-4.3-arm7-api-16/debug: 10
             android.*: 4
             default: 1
     e10s:
         by-test-platform:
-            windows10-64/debug: both
+            linux32/debug: both
             default: true
     tier:
         by-test-platform:
             linux64-qr/.*: 1
             windows10-64-asan.*: 3
             default: default
 
 jsreftest:
@@ -67,17 +67,16 @@ jsreftest:
             linux64-ccov/.*: 5
             linux64-qr/.*: 4
             linux32/debug: 5
             macosx.*: 2
             default: 3
     e10s:
         by-test-platform:
             linux64-jsdcov/opt: false
-            windows10-64/debug: both
             default: true
     max-run-time:
         by-test-platform:
             android.*: 7200
             default: 3600
     tier:
         by-test-platform:
             linux64-qr/.*: 1
@@ -103,17 +102,17 @@ reftest:
             android.*: 24
             macosx64.*/opt: 1
             macosx64.*/debug: 2
             windows10-64.*/opt: 1
             windows10-64.*/debug: 2
             default: 8
     e10s:
         by-test-platform:
-            windows10-64/debug: both
+            linux32/debug: both
             default: true
     max-run-time:
         by-test-platform:
             android.*: 7200
             default: 3600
     mozharness:
         chunked:
             by-test-platform:
@@ -157,17 +156,16 @@ reftest-no-accel:
         by-test-platform:
             macosx.*: 1
             windows10-64.*/debug: 2
             windows10-64.*/opt: 1
             default: 8
     e10s:
         by-test-platform:
             linux64-jsdcov/opt: false
-            windows10-64/debug: both
             default: true
     mozharness:
         chunked:
             by-test-platform:
                 windows10-64.*/opt: false
                 macosx.*: false
                 default: true
     tier:

--- a/taskcluster/ci/test/web-platform.yml
+++ b/taskcluster/ci/test/web-platform.yml
@@ -22,17 +22,17 @@ web-platform-tests:
         by-test-platform:
             macosx64/opt: 5
             macosx64/debug: 10
             windows10-64-ccov/debug: 15
             default: 12
     max-run-time: 7200
     e10s:
         by-test-platform:
-            windows7-32/debug: both
+            linux32/debug: both
             default: true
     mozharness:
         chunked: true
         extra-options:
             - --test-type=testharness
 
 web-platform-tests-headless:
     description: "Web platform test headless run"
@@ -68,34 +68,34 @@ web-platform-tests-reftests:
     treeherder-symbol: W(Wr)
     chunks:
         by-test-platform:
             macosx.*: 1
             windows.*: 1
             default: 6
     e10s:
         by-test-platform:
-            windows7-32/debug: both
+            linux32/debug: both
             default: true
     mozharness:
         extra-options:
             - --test-type=reftest
 
 web-platform-tests-reftests-headless:
     description: "Web platform reftest headless run"
     suite: web-platform-tests-reftests
     treeherder-symbol: W(WrH)
     chunks:
         by-test-platform:
             macosx.*: 1
             windows.*: 1
             default: 6
     e10s:
         by-test-platform:
-            windows7-32/debug: both
+            linux32/debug: both
             default: true
     run-on-projects: []  # disabled pending releng approval
     mozharness:
         extra-options:
             by-test-platform:
                 windows.*:
                     - --test-type=reftest
                     - --headless

--- a/testing/web-platform/meta/2dcontext/imagebitmap/createImageBitmap-invalid-args.html.ini
+++ b/testing/web-platform/meta/2dcontext/imagebitmap/createImageBitmap-invalid-args.html.ini
@@ -1,17 +1,19 @@
 [createImageBitmap-invalid-args.html]
   expected:
     if debug and not stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86") and (bits == 32): CRASH
+    if debug and not stylo and not e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86") and (bits == 32): CRASH
     if debug and not stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86_64") and (bits == 64): CRASH
     if debug and stylo and e10s and (os == "mac") and (version == "OS X 10.10.5") and (processor == "x86_64") and (bits == 64): CRASH
     if debug and stylo and e10s and (os == "win") and (version == "10.0.15063") and (processor == "x86_64") and (bits == 64): CRASH
     if debug and stylo and not e10s and (os == "win") and (version == "6.1.7601") and (processor == "x86") and (bits == 32): CRASH
     if debug and stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86_64") and (bits == 64): CRASH
     if debug and stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86") and (bits == 32): CRASH
+    if debug and stylo and not e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86") and (bits == 32): CRASH
     if debug and stylo and e10s and (os == "win") and (version == "6.1.7601") and (processor == "x86") and (bits == 32): CRASH
   [createImageBitmap with a HTMLImageElement source and sw set to 0 rejects with a RangeError.]
     expected: FAIL
 
   [createImageBitmap with a HTMLImageElement source and sh set to 0 rejects with a RangeError.]
     expected: FAIL
 
   [createImageBitmap with a HTMLImageElement source and oversized (unallocatable) crop region rejects with an InvalidStateError DOMException.]

--- a/testing/web-platform/meta/FileAPI/file/File-constructor-endings.html.ini
+++ b/testing/web-platform/meta/FileAPI/file/File-constructor-endings.html.ini
@@ -44,16 +44,17 @@
       if debug and not stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86_64") and (bits == 64): FAIL
       if debug and stylo and e10s and (os == "mac") and (version == "OS X 10.10.5") and (processor == "x86_64") and (bits == 64): FAIL
       if not debug and stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86_64") and (bits == 64): FAIL
       if not debug and not stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86") and (bits == 32): FAIL
       if not debug and stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86") and (bits == 32): FAIL
       if not debug and not stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86_64") and (bits == 64): FAIL
       if debug and stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86_64") and (bits == 64): FAIL
       if debug and stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86") and (bits == 32): FAIL
+      if debug and stylo and not e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86") and (bits == 32): FAIL
 
   [Input CRCR with endings 'native']
     expected: FAIL
 
   [Input LFCR with endings 'native']
     expected: FAIL
 
   [Input LFLF with endings 'native']
@@ -77,28 +78,30 @@
       if debug and not stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86_64") and (bits == 64): FAIL
       if debug and stylo and e10s and (os == "mac") and (version == "OS X 10.10.5") and (processor == "x86_64") and (bits == 64): FAIL
       if not debug and stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86_64") and (bits == 64): FAIL
       if not debug and not stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86") and (bits == 32): FAIL
       if not debug and stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86") and (bits == 32): FAIL
       if not debug and not stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86_64") and (bits == 64): FAIL
       if debug and stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86_64") and (bits == 64): FAIL
       if debug and stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86") and (bits == 32): FAIL
+      if debug and stylo and not e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86") and (bits == 32): FAIL
 
   [Input CRLFCRLF with endings 'native']
     expected:
       if debug and not stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86") and (bits == 32): FAIL
       if not debug and stylo and e10s and (os == "mac") and (version == "OS X 10.10.5") and (processor == "x86_64") and (bits == 64): FAIL
       if debug and not stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86_64") and (bits == 64): FAIL
       if debug and stylo and e10s and (os == "mac") and (version == "OS X 10.10.5") and (processor == "x86_64") and (bits == 64): FAIL
       if not debug and stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86_64") and (bits == 64): FAIL
       if not debug and not stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86") and (bits == 32): FAIL
       if not debug and stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86") and (bits == 32): FAIL
       if not debug and not stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86_64") and (bits == 64): FAIL
       if debug and stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86_64") and (bits == 64): FAIL
       if debug and stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86") and (bits == 32): FAIL
+      if debug and stylo and not e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86") and (bits == 32): FAIL
 
   [Input LFCRLFCR with endings 'native']
     expected: FAIL
 
   [CR/LF in adjacent input strings]
     expected: FAIL
 

--- a/testing/web-platform/meta/mediacapture-streams/MediaStream-MediaElement-preload-none.https.html.ini
+++ b/testing/web-platform/meta/mediacapture-streams/MediaStream-MediaElement-preload-none.https.html.ini
@@ -7,27 +7,29 @@
     if not debug and stylo and e10s and (os == "win") and (version == "10.0.15063") and (processor == "x86_64") and (bits == 64): TIMEOUT
     if not debug and stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86_64") and (bits == 64): TIMEOUT
     if debug and stylo and not e10s and (os == "win") and (version == "6.1.7601") and (processor == "x86") and (bits == 32): TIMEOUT
     if not debug and stylo and e10s and (os == "win") and (version == "6.1.7601") and (processor == "x86") and (bits == 32): TIMEOUT
     if not debug and stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86") and (bits == 32): TIMEOUT
     if not debug and not stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86_64") and (bits == 64): TIMEOUT
     if debug and stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86_64") and (bits == 64): TIMEOUT
     if debug and stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86") and (bits == 32): TIMEOUT
+    if debug and stylo and not e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86") and (bits == 32): TIMEOUT
     if debug and stylo and e10s and (os == "win") and (version == "6.1.7601") and (processor == "x86") and (bits == 32): TIMEOUT
   [Test that preload 'none' is ignored for MediaStream object URL used as src]
     expected:
       if debug and not stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86_64") and (bits == 64): TIMEOUT
       if debug and stylo and e10s and (os == "win") and (version == "10.0.15063") and (processor == "x86_64") and (bits == 64): TIMEOUT
       if not debug and stylo and e10s and (os == "win") and (version == "10.0.15063") and (processor == "x86_64") and (bits == 64): TIMEOUT
       if not debug and stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86_64") and (bits == 64): TIMEOUT
       if debug and stylo and not e10s and (os == "win") and (version == "6.1.7601") and (processor == "x86") and (bits == 32): TIMEOUT
       if not debug and stylo and e10s and (os == "win") and (version == "6.1.7601") and (processor == "x86") and (bits == 32): TIMEOUT
       if not debug and stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86") and (bits == 32): TIMEOUT
       if not debug and not stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86_64") and (bits == 64): TIMEOUT
       if debug and stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86_64") and (bits == 64): TIMEOUT
       if debug and stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86") and (bits == 32): TIMEOUT
+      if debug and stylo and not e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86") and (bits == 32): TIMEOUT
       if debug and stylo and e10s and (os == "win") and (version == "6.1.7601") and (processor == "x86") and (bits == 32): TIMEOUT
       FAIL
 
   [Test that preload 'none' is ignored for MediaStream used as srcObject]
     expected: FAIL
 

--- a/testing/web-platform/meta/mediacapture-streams/MediaStreamTrack-idl.https.html.ini
+++ b/testing/web-platform/meta/mediacapture-streams/MediaStreamTrack-idl.https.html.ini
@@ -11,16 +11,17 @@
     if not debug and not stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86") and (bits == 32): TIMEOUT
     if debug and stylo and not e10s and (os == "win") and (version == "6.1.7601") and (processor == "x86") and (bits == 32): TIMEOUT
     if not debug and stylo and e10s and (os == "win") and (version == "6.1.7601") and (processor == "x86") and (bits == 32): TIMEOUT
     if not debug and stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86") and (bits == 32): TIMEOUT
     if not debug and not stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86_64") and (bits == 64): TIMEOUT
     if debug and stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86_64") and (bits == 64): TIMEOUT
     if debug and stylo and e10s and (os == "win") and (version == "6.1.7601") and (processor == "x86") and (bits == 32): TIMEOUT
     if debug and stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86") and (bits == 32): TIMEOUT
+    if debug and stylo and not e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86") and (bits == 32): TIMEOUT
     if debug and not stylo and e10s and (os == "win") and (version == "10.0.15063") and (processor == "x86_64") and (bits == 64): TIMEOUT
   [Test driver]
     expected:
       if debug and not stylo and e10s and (os == "win") and (version == "6.1.7601") and (processor == "x86") and (bits == 32): TIMEOUT
       if not debug and not stylo and e10s and (os == "win") and (version == "6.1.7601") and (processor == "x86") and (bits == 32): TIMEOUT
       if not debug and not stylo and e10s and (os == "win") and (version == "10.0.15063") and (processor == "x86_64") and (bits == 64): TIMEOUT
       if debug and not stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86") and (bits == 32): TIMEOUT
       if not debug and stylo and e10s and (os == "mac") and (version == "OS X 10.10.5") and (processor == "x86_64") and (bits == 64): FAIL
@@ -34,10 +35,11 @@
       if debug and stylo and not e10s and (os == "win") and (version == "6.1.7601") and (processor == "x86") and (bits == 32): TIMEOUT
       if not debug and stylo and e10s and (os == "win") and (version == "6.1.7601") and (processor == "x86") and (bits == 32): TIMEOUT
       if not debug and stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86") and (bits == 32): TIMEOUT
       if not debug and not stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86_64") and (bits == 64): TIMEOUT
       if debug and not stylo and e10s and (os == "mac") and (version == "OS X 10.10.5") and (processor == "x86_64") and (bits == 64): FAIL
       if debug and stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86_64") and (bits == 64): TIMEOUT
       if debug and stylo and e10s and (os == "win") and (version == "6.1.7601") and (processor == "x86") and (bits == 32): TIMEOUT
       if debug and stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86") and (bits == 32): TIMEOUT
+      if debug and stylo and not e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86") and (bits == 32): TIMEOUT
       if debug and not stylo and e10s and (os == "win") and (version == "10.0.15063") and (processor == "x86_64") and (bits == 64): TIMEOUT
 

--- a/testing/web-platform/meta/streams/readable-byte-streams/detached-buffers.dedicatedworker.html.ini
+++ b/testing/web-platform/meta/streams/readable-byte-streams/detached-buffers.dedicatedworker.html.ini
@@ -16,16 +16,17 @@
     if debug and not stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86") and (bits == 32): CRASH
     if debug and not stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86_64") and (bits == 64): CRASH
     if not debug and stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86_64") and (bits == 64): TIMEOUT
     if not debug and not stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86") and (bits == 32): TIMEOUT
     if not debug and stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86") and (bits == 32): TIMEOUT
     if not debug and not stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86_64") and (bits == 64): TIMEOUT
     if debug and stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86_64") and (bits == 64): CRASH
     if debug and stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86") and (bits == 32): CRASH
+    if debug and stylo and not e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86") and (bits == 32): CRASH
   [ReadableStream with byte source: read()ing from a closed stream still transfers the buffer]
     expected: FAIL
 
   [ReadableStream with byte source: read()ing from a stream with queued chunks still transfers the buffer]
     expected: FAIL
 
   [ReadableStream with byte source: reading into an already-detached buffer rejects]
     expected: TIMEOUT

--- a/testing/web-platform/meta/streams/readable-byte-streams/detached-buffers.html.ini
+++ b/testing/web-platform/meta/streams/readable-byte-streams/detached-buffers.html.ini
@@ -16,16 +16,17 @@
     if debug and not stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86") and (bits == 32): CRASH
     if debug and not stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86_64") and (bits == 64): CRASH
     if not debug and stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86_64") and (bits == 64): TIMEOUT
     if not debug and not stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86") and (bits == 32): TIMEOUT
     if not debug and stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86") and (bits == 32): TIMEOUT
     if not debug and not stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86_64") and (bits == 64): TIMEOUT
     if debug and stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86_64") and (bits == 64): CRASH
     if debug and stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86") and (bits == 32): CRASH
+    if debug and stylo and not e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86") and (bits == 32): CRASH
   [ReadableStream with byte source: read()ing from a closed stream still transfers the buffer]
     expected: FAIL
 
   [ReadableStream with byte source: read()ing from a stream with queued chunks still transfers the buffer]
     expected: FAIL
 
   [ReadableStream with byte source: reading into an already-detached buffer rejects]
     expected: TIMEOUT

--- a/testing/web-platform/meta/streams/readable-byte-streams/detached-buffers.serviceworker.https.html.ini
+++ b/testing/web-platform/meta/streams/readable-byte-streams/detached-buffers.serviceworker.https.html.ini
@@ -16,16 +16,17 @@
     if debug and not stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86") and (bits == 32): CRASH
     if debug and not stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86_64") and (bits == 64): CRASH
     if not debug and stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86_64") and (bits == 64): TIMEOUT
     if not debug and not stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86") and (bits == 32): TIMEOUT
     if not debug and stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86") and (bits == 32): TIMEOUT
     if not debug and not stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86_64") and (bits == 64): TIMEOUT
     if debug and stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86_64") and (bits == 64): CRASH
     if debug and stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86") and (bits == 32): CRASH
+    if debug and stylo and not e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86") and (bits == 32): CRASH
   [ReadableStream with byte source: read()ing from a closed stream still transfers the buffer]
     expected: FAIL
 
   [ReadableStream with byte source: read()ing from a stream with queued chunks still transfers the buffer]
     expected: FAIL
 
   [ReadableStream with byte source: reading into an already-detached buffer rejects]
     expected: TIMEOUT

--- a/testing/web-platform/meta/streams/readable-byte-streams/detached-buffers.sharedworker.html.ini
+++ b/testing/web-platform/meta/streams/readable-byte-streams/detached-buffers.sharedworker.html.ini
@@ -16,16 +16,17 @@
     if debug and not stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86") and (bits == 32): CRASH
     if debug and not stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86_64") and (bits == 64): CRASH
     if not debug and stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86_64") and (bits == 64): TIMEOUT
     if not debug and not stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86") and (bits == 32): TIMEOUT
     if not debug and stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86") and (bits == 32): TIMEOUT
     if not debug and not stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86_64") and (bits == 64): TIMEOUT
     if debug and stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86_64") and (bits == 64): CRASH
     if debug and stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86") and (bits == 32): CRASH
+    if debug and stylo and not e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86") and (bits == 32): CRASH
   [ReadableStream with byte source: read()ing from a closed stream still transfers the buffer]
     expected: FAIL
 
   [ReadableStream with byte source: read()ing from a stream with queued chunks still transfers the buffer]
     expected: FAIL
 
   [ReadableStream with byte source: reading into an already-detached buffer rejects]
     expected: TIMEOUT

--- a/testing/web-platform/meta/streams/readable-streams/tee.dedicatedworker.html.ini
+++ b/testing/web-platform/meta/streams/readable-streams/tee.dedicatedworker.html.ini
@@ -5,9 +5,10 @@
     if debug and not stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86_64") and (bits == 64): CRASH
     if debug and stylo and e10s and (os == "mac") and (version == "OS X 10.10.5") and (processor == "x86_64") and (bits == 64): CRASH
     if debug and stylo and e10s and (os == "win") and (version == "10.0.15063") and (processor == "x86_64") and (bits == 64): CRASH
     if debug and stylo and not e10s and (os == "win") and (version == "6.1.7601") and (processor == "x86") and (bits == 32): CRASH
     if debug and not stylo and e10s and (os == "mac") and (version == "OS X 10.10.5") and (processor == "x86_64") and (bits == 64): CRASH
     if debug and stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86_64") and (bits == 64): CRASH
     if debug and stylo and e10s and (os == "win") and (version == "6.1.7601") and (processor == "x86") and (bits == 32): CRASH
     if debug and stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86") and (bits == 32): CRASH
+    if debug and stylo and not e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86") and (bits == 32): CRASH
     if debug and not stylo and e10s and (os == "win") and (version == "10.0.15063") and (processor == "x86_64") and (bits == 64): CRASH

--- a/testing/web-platform/meta/streams/readable-streams/tee.html.ini
+++ b/testing/web-platform/meta/streams/readable-streams/tee.html.ini
@@ -5,9 +5,10 @@
     if debug and not stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86_64") and (bits == 64): CRASH
     if debug and stylo and e10s and (os == "mac") and (version == "OS X 10.10.5") and (processor == "x86_64") and (bits == 64): CRASH
     if debug and stylo and e10s and (os == "win") and (version == "10.0.15063") and (processor == "x86_64") and (bits == 64): CRASH
     if debug and stylo and not e10s and (os == "win") and (version == "6.1.7601") and (processor == "x86") and (bits == 32): CRASH
     if debug and not stylo and e10s and (os == "mac") and (version == "OS X 10.10.5") and (processor == "x86_64") and (bits == 64): CRASH
     if debug and stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86_64") and (bits == 64): CRASH
     if debug and stylo and e10s and (os == "win") and (version == "6.1.7601") and (processor == "x86") and (bits == 32): CRASH
     if debug and stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86") and (bits == 32): CRASH
+    if debug and stylo and not e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86") and (bits == 32): CRASH
     if debug and not stylo and e10s and (os == "win") and (version == "10.0.15063") and (processor == "x86_64") and (bits == 64): CRASH

--- a/testing/web-platform/meta/streams/readable-streams/tee.serviceworker.https.html.ini
+++ b/testing/web-platform/meta/streams/readable-streams/tee.serviceworker.https.html.ini
@@ -5,9 +5,10 @@
     if debug and not stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86_64") and (bits == 64): CRASH
     if debug and stylo and e10s and (os == "mac") and (version == "OS X 10.10.5") and (processor == "x86_64") and (bits == 64): CRASH
     if debug and stylo and e10s and (os == "win") and (version == "10.0.15063") and (processor == "x86_64") and (bits == 64): CRASH
     if debug and stylo and not e10s and (os == "win") and (version == "6.1.7601") and (processor == "x86") and (bits == 32): CRASH
     if debug and not stylo and e10s and (os == "mac") and (version == "OS X 10.10.5") and (processor == "x86_64") and (bits == 64): CRASH
     if debug and stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86_64") and (bits == 64): CRASH
     if debug and stylo and e10s and (os == "win") and (version == "6.1.7601") and (processor == "x86") and (bits == 32): CRASH
     if debug and stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86") and (bits == 32): CRASH
+    if debug and stylo and not e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86") and (bits == 32): CRASH
     if debug and not stylo and e10s and (os == "win") and (version == "10.0.15063") and (processor == "x86_64") and (bits == 64): CRASH

--- a/testing/web-platform/meta/streams/readable-streams/tee.sharedworker.html.ini
+++ b/testing/web-platform/meta/streams/readable-streams/tee.sharedworker.html.ini
@@ -5,9 +5,10 @@
     if debug and not stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86_64") and (bits == 64): CRASH
     if debug and stylo and e10s and (os == "mac") and (version == "OS X 10.10.5") and (processor == "x86_64") and (bits == 64): CRASH
     if debug and stylo and e10s and (os == "win") and (version == "10.0.15063") and (processor == "x86_64") and (bits == 64): CRASH
     if debug and stylo and not e10s and (os == "win") and (version == "6.1.7601") and (processor == "x86") and (bits == 32): CRASH
     if debug and not stylo and e10s and (os == "mac") and (version == "OS X 10.10.5") and (processor == "x86_64") and (bits == 64): CRASH
     if debug and stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86_64") and (bits == 64): CRASH
     if debug and stylo and e10s and (os == "win") and (version == "6.1.7601") and (processor == "x86") and (bits == 32): CRASH
     if debug and stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86") and (bits == 32): CRASH
+    if debug and stylo and not e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86") and (bits == 32): CRASH
     if debug and not stylo and e10s and (os == "win") and (version == "10.0.15063") and (processor == "x86_64") and (bits == 64): CRASH

--- a/testing/web-platform/meta/svg/path/bearing/absolute.svg.ini
+++ b/testing/web-platform/meta/svg/path/bearing/absolute.svg.ini
@@ -5,8 +5,9 @@
     if debug and not stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86_64") and (bits == 64): FAIL
     if debug and stylo and e10s and (os == "mac") and (version == "OS X 10.10.5") and (processor == "x86_64") and (bits == 64): FAIL
     if not debug and stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86_64") and (bits == 64): FAIL
     if not debug and not stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86") and (bits == 32): FAIL
     if not debug and stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86") and (bits == 32): FAIL
     if not debug and not stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86_64") and (bits == 64): FAIL
     if debug and stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86_64") and (bits == 64): FAIL
     if debug and stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86") and (bits == 32): FAIL
+    if debug and stylo and not e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86") and (bits == 32): FAIL

--- a/testing/web-platform/meta/svg/path/bearing/relative.svg.ini
+++ b/testing/web-platform/meta/svg/path/bearing/relative.svg.ini
@@ -5,8 +5,9 @@
     if debug and not stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86_64") and (bits == 64): FAIL
     if debug and stylo and e10s and (os == "mac") and (version == "OS X 10.10.5") and (processor == "x86_64") and (bits == 64): FAIL
     if not debug and stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86_64") and (bits == 64): FAIL
     if not debug and not stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86") and (bits == 32): FAIL
     if not debug and stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86") and (bits == 32): FAIL
     if not debug and not stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86_64") and (bits == 64): FAIL
     if debug and stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86_64") and (bits == 64): FAIL
     if debug and stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86") and (bits == 32): FAIL
+    if debug and stylo and not e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86") and (bits == 32): FAIL

--- a/testing/web-platform/meta/svg/path/bearing/zero.svg.ini
+++ b/testing/web-platform/meta/svg/path/bearing/zero.svg.ini
@@ -5,8 +5,9 @@
     if debug and not stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86_64") and (bits == 64): FAIL
     if debug and stylo and e10s and (os == "mac") and (version == "OS X 10.10.5") and (processor == "x86_64") and (bits == 64): FAIL
     if not debug and stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86_64") and (bits == 64): FAIL
     if not debug and not stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86") and (bits == 32): FAIL
     if not debug and stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86") and (bits == 32): FAIL
     if not debug and not stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86_64") and (bits == 64): FAIL
     if debug and stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86_64") and (bits == 64): FAIL
     if debug and stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86") and (bits == 32): FAIL
+    if debug and stylo and not e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86") and (bits == 32): FAIL

--- a/testing/web-platform/meta/svg/path/property/priority.svg.ini
+++ b/testing/web-platform/meta/svg/path/property/priority.svg.ini
@@ -5,8 +5,9 @@
     if debug and not stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86_64") and (bits == 64): FAIL
     if debug and stylo and e10s and (os == "mac") and (version == "OS X 10.10.5") and (processor == "x86_64") and (bits == 64): FAIL
     if not debug and stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86_64") and (bits == 64): FAIL
     if not debug and not stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86") and (bits == 32): FAIL
     if not debug and stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86") and (bits == 32): FAIL
     if not debug and not stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86_64") and (bits == 64): FAIL
     if debug and stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86_64") and (bits == 64): FAIL
     if debug and stylo and e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86") and (bits == 32): FAIL
+    if debug and stylo and not e10s and (os == "linux") and (version == "Ubuntu 16.04") and (processor == "x86") and (bits == 32): FAIL