--- a/taskcluster/ci/test/reftest.yml
+++ b/taskcluster/ci/test/reftest.yml
@@ -175,15 +175,8 @@ reftest-no-accel:
             by-test-platform:
                 windows10-64.*/opt: false
                 macosx.*: false
                 default: true
     tier:
         by-test-platform:
             windows10-64-asan.*: 3
             default: default
-
-reftest-stylo:
-    description: "Reftest run in Stylo vs. Gecko mode"
-    suite: reftest/reftest-stylo
-    treeherder-symbol: R(Rs)
-    virtualization: virtual-with-gpu
-    chunks: 8

--- a/taskcluster/ci/test/test-platforms.yml
+++ b/taskcluster/ci/test/test-platforms.yml
@@ -35,25 +35,23 @@ linux32-devedition/opt:
         - linux32-tests
         - linux32-opt-tests
 
 linux64/debug:
     build-platform: linux64/debug
     test-sets:
         - common-tests
         - web-platform-tests
-        - reftest-stylo
         - mochitest-headless
 linux64/opt:
     build-platform: linux64/opt
     test-sets:
         - common-tests
         - web-platform-tests
         - opt-only-tests
-        - reftest-stylo
         - desktop-screenshot-capture
         - talos
         - awsy
         - mochitest-headless
         - linux-talos-flex
 linux64-nightly/opt:
     build-platform: linux64-nightly/opt
     test-sets:

--- a/taskcluster/ci/test/test-sets.yml
+++ b/taskcluster/ci/test/test-sets.yml
@@ -78,19 +78,16 @@ awsy:
     - awsy
 
 awsy-stylo-sequential:
     - awsy-stylo-sequential
 
 ##
 # Limited test sets for specific platforms
 
-reftest-stylo:
-    - reftest-stylo
-
 linux-qr-talos:
     - talos-chrome
     - talos-dromaeojs
     - talos-g1
     # - talos-g2 # doesn't work with QR yet
     - talos-g3
     - talos-g4
     - talos-g5

--- a/taskcluster/taskgraph/try_option_syntax.py
+++ b/taskcluster/taskgraph/try_option_syntax.py
@@ -93,17 +93,16 @@ UNITTEST_ALIASES = {
     'mochitest-clipboard-e10s': alias_prefix('mochitest-clipboard-e10s'),
     'mochitest-media': alias_prefix('mochitest-media'),
     'mochitest-media-e10s': alias_prefix('mochitest-media-e10s'),
     'mochitest-vg': alias_prefix('mochitest-valgrind'),
     'reftest': alias_matches(r'^(plain-)?reftest.*$'),
     'reftest-no-accel': alias_matches(r'^(plain-)?reftest-no-accel.*$'),
     'reftests': alias_matches(r'^(plain-)?reftest.*$'),
     'reftests-e10s': alias_matches(r'^(plain-)?reftest-e10s.*$'),
-    'reftest-stylo': alias_matches(r'^(plain-)?reftest-stylo.*$'),
     'reftest-gpu': alias_matches(r'^(plain-)?reftest-gpu.*$'),
     'robocop': alias_prefix('robocop'),
     'web-platform-test': alias_prefix('web-platform-tests'),
     'web-platform-tests': alias_prefix('web-platform-tests'),
     'web-platform-tests-e10s': alias_prefix('web-platform-tests-e10s'),
     'web-platform-tests-reftests': alias_prefix('web-platform-tests-reftests'),
     'web-platform-tests-reftests-e10s': alias_prefix('web-platform-tests-reftests-e10s'),
     'web-platform-tests-wdspec': alias_prefix('web-platform-tests-wdspec'),

--- a/testing/mozharness/configs/unittests/linux_unittest.py
+++ b/testing/mozharness/configs/unittests/linux_unittest.py
@@ -210,21 +210,16 @@ config = {
                         "--setpref=layers.acceleration.force-enabled=true"],
             "tests": ["tests/reftest/tests/layout/reftests/reftest.list"]
         },
         "reftest-no-accel": {
             "options": ["--suite=reftest",
                         "--setpref=layers.acceleration.disabled=true"],
             "tests": ["tests/reftest/tests/layout/reftests/reftest.list"]
         },
-        "reftest-stylo": {
-            "options": ["--suite=reftest",
-                        "--setpref=reftest.compareStyloToGecko=true"],
-            "tests": ["tests/reftest/tests/layout/reftests/reftest.list"],
-        },
     },
     "all_xpcshell_suites": {
         "xpcshell": {
             "options": ["--xpcshell=%(abs_app_dir)s/" + XPCSHELL_NAME,
                         "--manifest=tests/xpcshell/tests/xpcshell.ini"],
             "tests": []
         },
         "xpcshell-addons": {

--- a/testing/mozharness/configs/unittests/mac_unittest.py
+++ b/testing/mozharness/configs/unittests/mac_unittest.py
@@ -167,21 +167,16 @@ config = {
             'options':["--extra-profile-file=tests/jsreftest/tests/user.js",
                        "--suite=jstestbrowser"],
             'tests': ["tests/jsreftest/tests/jstests.list"]
         },
         "reftest": {
             'options': ["--suite=reftest"],
             'tests': ["tests/reftest/tests/layout/reftests/reftest.list"]
         },
-        "reftest-stylo": {
-            "options": ["--suite=reftest",
-                        "--setpref=reftest.compareStyloToGecko=true"],
-            "tests": ["tests/reftest/tests/layout/reftests/reftest.list"],
-        },
     },
     "all_xpcshell_suites": {
         "xpcshell": {
             'options': ["--xpcshell=%(abs_app_dir)s/" + XPCSHELL_NAME,
                         "--manifest=tests/xpcshell/tests/xpcshell.ini"],
             'tests': []
         },
         "xpcshell-addons": {

--- a/testing/mozharness/configs/unittests/win_taskcluster_unittest.py
+++ b/testing/mozharness/configs/unittests/win_taskcluster_unittest.py
@@ -200,21 +200,16 @@ config = {
                         "--setpref=layers.gpu-process.force-enabled=true"],
             'tests': ["tests/reftest/tests/layout/reftests/reftest.list"]
         },
         "reftest-no-accel": {
             "options": ["--suite=reftest",
                         "--setpref=layers.acceleration.disabled=true"],
             "tests": ["tests/reftest/tests/layout/reftests/reftest.list"]
         },
-        "reftest-stylo": {
-            "options": ["--suite=reftest",
-                        "--setpref=reftest.compareStyloToGecko=true"],
-            "tests": ["tests/reftest/tests/layout/reftests/reftest.list"],
-        },
     },
     "all_xpcshell_suites": {
         "xpcshell": {
             'options': ["--xpcshell=%(abs_app_dir)s/" + XPCSHELL_NAME,
                         "--manifest=tests/xpcshell/tests/xpcshell.ini"],
             'tests': []
         },
         "xpcshell-addons": {

--- a/tools/tryselect/docs/selectors/fuzzy.rst
+++ b/tools/tryselect/docs/selectors/fuzzy.rst
@@ -101,24 +101,20 @@ Would produce the following ``try_task_c
       "templates":{
         "env":{
           "MOZHARNESS_TEST_PATHS":"layout/reftests/reftest-sanity"
         }
       },
       "tasks":[
         "test-linux64-qr/debug-reftest-e10s-1",
         "test-linux64-qr/opt-reftest-e10s-1",
-        "test-linux64-stylo-disabled/debug-reftest-e10s-1",
-        "test-linux64-stylo-disabled/opt-reftest-e10s-1",
         "test-linux64/debug-reftest-e10s-1",
         "test-linux64/debug-reftest-no-accel-e10s-1",
-        "test-linux64/debug-reftest-stylo-e10s-1",
         "test-linux64/opt-reftest-e10s-1",
         "test-linux64/opt-reftest-no-accel-e10s-1",
-        "test-linux64/opt-reftest-stylo-e10s-1"
       ]
     }
 
 Inside of these tasks, the reftest harness will only run tests that live under
 ``layout/reftests/reftest-sanity``.
 
 Additional Arguments
 --------------------