--- a/gfx/tests/crashtests/crashtests.list
+++ b/gfx/tests/crashtests/crashtests.list
@@ -81,20 +81,20 @@ load 532726-1.html
 load 538065-1.html
 load 546870-1.html
 load 557348-1.html
 load 563740-1.html
 load 580100-1.html
 load 580212-1.html
 load 580233-1.html
 load 580719-1.html
-load 593526.html
-load 593526.xul
+pref(layout.css.moz-appearance.enabled,true) load 593526.html
+pref(layout.css.moz-appearance.enabled,true) load 593526.xul
 load 594654-1.xhtml
-load 595042-1.html
+pref(layout.css.moz-appearance.enabled,true) load 595042-1.html
 load 595727-1.html
 load 624198.xhtml
 load 633322-1.html
 load 633453-1.html
 load 662467-1.html
 load 665218.html
 load 675550-1.html
 load 686190-1.html

--- a/layout/base/crashtests/crashtests.list
+++ b/layout/base/crashtests/crashtests.list
@@ -426,17 +426,17 @@ load 793848.html
 load 795646.html
 skip load 802902.html # bug 901752
 load 806056-1.html
 load 806056-2.html
 load 812665.html
 load 813372-1.html
 load 817219.html
 load 818454.html
-load 822865.html
+pref(layout.css.moz-appearance.enabled,true) load 822865.html
 load 824300.html
 load 824862.html
 load 826163.html
 load 833604-1.html
 load 835056.html
 load 836990-1.html
 load 840480.html
 load 842114.html

--- a/layout/forms/crashtests/crashtests.list
+++ b/layout/forms/crashtests/crashtests.list
@@ -21,17 +21,17 @@ load 370703-1.html
 load 370940-1.html
 load 370967.html
 load 373586-1.xhtml
 load 375299.html
 load 378369.html
 load 378413-1.xhtml
 load 380116-1.xhtml
 load 382212-1.xhtml
-load 382610-1.html
+pref(layout.css.moz-appearance.enabled,true) load 382610-1.html
 load 383887-1.html
 load 386554-1.html
 load 388374-1.xhtml
 load 388374-2.html
 load 393656-1.xhtml
 load 393656-2.xhtml
 load 399262.html
 load 402852-1.html
@@ -57,13 +57,13 @@ load 682684.xhtml
 load 865602.html
 load 893332-1.html
 load 944198.html
 skip-if(stylo) load 949891.xhtml # bug 1323693, bug 1341973
 load 959311.html
 load 960277-2.html
 load 997709-1.html
 load 1102791.html
-skip-if(stylo) load 1140216.html # bug 1323693, bug 1341973
+pref(layout.css.moz-appearance.enabled,true) skip-if(stylo) load 1140216.html # bug 1323693, bug 1341973
 load 1182414.html
 load 1212688.html
 load 1228670.xhtml
 load 1279354.html

--- a/layout/generic/crashtests/crashtests.list
+++ b/layout/generic/crashtests/crashtests.list
@@ -105,26 +105,26 @@ load 375831.html
 load 376419.html
 load 377522.html
 load 379217-1.xhtml
 load 379217-2.xhtml
 load 379917-1.xhtml
 load 380012-1.html
 load 381152-1.html
 load 381786-1.html
-load 382129-1.xhtml
+pref(layout.css.moz-appearance.enabled,true) load 382129-1.xhtml
 load 382131-1.html
 load 382199-1.html
 load 382208-1.xhtml
 load 382262-1.html
 load 382396-1.xhtml
 load 382745-1.xhtml
 load 383089-1.html
 load 385265-1.xhtml
-load 385295-1.xhtml
+pref(layout.css.moz-appearance.enabled,true) load 385295-1.xhtml
 load 385344-1.html
 load 385344-2.html
 load 385414-1.html
 load 385414-2.html
 load 385426-1.html
 load 385526.html
 load 385681.html
 load 385885-1.xul
@@ -180,17 +180,17 @@ load 398332-2.html
 asserts(0-2) load 398332-3.html # bug 436123 and bug 457397
 load 399407-1.xhtml
 load 399412-1.html
 load 399843-1.html
 load 400078-1.html
 load 400190.html
 load 400223-1.html # bug 1323652
 load 400232-1.html
-load 400244-1.html
+pref(layout.css.moz-appearance.enabled,true) load 400244-1.html
 load 400768-1.xhtml
 load 400768-2.xhtml
 load 401042-1.xhtml
 load 402380-1.html
 load 402380-2.html
 load 402872-1.html
 load 402872-2.html
 load 403004.html
@@ -485,19 +485,19 @@ test-pref(font.size.inflation.emPerLine,
 load 747688.html
 load 750066.html
 load 757413.xhtml
 load 757413-2.html
 load 762764-1.html
 load 762902.html
 load 765409.html
 asserts(0-200) load 765621.html # bug 703550
-asserts(0-200) load 767765.html # bug 407550, bug 871758, and various nscoord_MAX related asserts
+pref(layout.css.moz-appearance.enabled,true) asserts(0-200) load 767765.html # bug 407550, bug 871758, and various nscoord_MAX related asserts
 load 769120.html
-asserts(0-2) load 769303-1.html # bug 1123979
+pref(layout.css.moz-appearance.enabled,true) asserts(0-2) load 769303-1.html # bug 1123979
 load 769303-2.html
 load 777838.html
 load 783228.html
 load 784600.html
 load 785555.html
 load 786740-1.html
 load 790260-1.html
 asserts(1) asserts-if(stylo,0) test-pref(font.size.inflation.emPerLine,15) load 791601.xhtml # Bug 871327

--- a/layout/reftests/flexbox/reftest.list
+++ b/layout/reftests/flexbox/reftest.list
@@ -8,17 +8,17 @@
 # Where possible & practical, we should try to address these so we can migrate
 # tests over to the w3c-css directory, so that they can become part of the
 # W3C's test suite.
 
 # SUBDIRECTORY: Reftests for paginated flex containers
 include pagination/reftest.list
 
 # Tests for cross-axis alignment (align-self / align-items properties)
-fails == flexbox-align-self-baseline-horiz-2.xhtml  flexbox-align-self-baseline-horiz-2-ref.xhtml # bug 793456, and possibly others
+pref(layout.css.moz-appearance.enabled,true) fails == flexbox-align-self-baseline-horiz-2.xhtml  flexbox-align-self-baseline-horiz-2-ref.xhtml # bug 793456, and possibly others
 # This one fails on windows R (but not Ru, strangely) and GTK.
 # On Windows R and GTK, the single-line <label> flex item has a different
 # background size in test vs. ref
 fuzzy-if(cocoaWidget,1,2) random-if(winWidget||gtkWidget) skip-if(Android) == flexbox-align-self-baseline-horiz-3.xhtml  flexbox-align-self-baseline-horiz-3-ref.xhtml # XXXdholbert investigate the random-if. The skip-if(Android) is because checkbox/radio appearance:none doesn't work as expected.
 == flexbox-align-self-baseline-horiz-4.xhtml flexbox-align-self-baseline-horiz-4-ref.xhtml
 
 # Tests for box-sizing on flex containers and flex items.
 == flexbox-box-sizing-on-container-horiz-1.html flexbox-box-sizing-on-container-horiz-1-ref.html

--- a/layout/reftests/forms/input/color/reftest.list
+++ b/layout/reftests/forms/input/color/reftest.list
@@ -5,10 +5,10 @@ fails-if(Android) == input-color-1.html 
 default-preferences pref(dom.forms.color,true)
 
 # Despite the "default-preferences" line above, Android is still
 # excluded from some style in forms.css, which makes the following tests fail.
 fails-if(Android) == margin-padding-1.html margin-padding-1-ref.html
 == block-invalidate-1.html block-invalidate-1-ref.html
 == block-invalidate-2.html block-invalidate-2-ref.html
 fuzzy-if(gtkWidget,8,33) fuzzy-if(skiaContent,8,35) fails-if(Android) == transformations-1.html transformations-1-ref.html
-fails-if(Android) == custom-style-1.html custom-style-1-ref.html
+pref(layout.css.moz-appearance.enabled,true) fails-if(Android) == custom-style-1.html custom-style-1-ref.html
 fails-if(Android) == custom-style-2.html custom-style-2-ref.html

--- a/layout/reftests/forms/input/number/reftest.list
+++ b/layout/reftests/forms/input/number/reftest.list
@@ -22,20 +22,20 @@ fuzzy-if(skiaContent,2,13) == show-value
 
 # disabled
 == number-disabled.html number-disabled-ref.html
 
 # auto width:
 == number-auto-width-1.html number-auto-width-1-ref.html
 
 # min-height/max-height tests:
-skip-if(Android) == number-min-height-1.html number-min-height-1-ref.html
-skip-if(Android) == number-min-height-2.html number-min-height-2-ref.html
-skip-if(Android) == number-max-height-1.html number-max-height-1-ref.html
-skip-if(Android) == number-max-height-2.html number-max-height-2-ref.html
+pref(layout.css.moz-appearance.enabled,true) skip-if(Android) == number-min-height-1.html number-min-height-1-ref.html
+pref(layout.css.moz-appearance.enabled,true) skip-if(Android) == number-min-height-2.html number-min-height-2-ref.html
+pref(layout.css.moz-appearance.enabled,true) skip-if(Android) == number-max-height-1.html number-max-height-1-ref.html
+pref(layout.css.moz-appearance.enabled,true) skip-if(Android) == number-max-height-2.html number-max-height-2-ref.html
 
 # number of significant fractional digits:
 == number-significant-fractional-digits.html number-significant-fractional-digits-ref.html
 
 # focus
 fuzzy-if(skiaContent,2,5) needs-focus == focus-handling.html focus-handling-ref.html
 
 # select
@@ -49,9 +49,9 @@ fuzzy-if(skiaContent,2,5) needs-focus ==
 # check that if the anonymous text control is reframed, we reframe the whole
 # number control (the fuzzy is for the top-right and bottom-left of the border
 # bevel which gets slightly different antialiasing after invalidation):
 fuzzy(128,4) == number-reframe-anon-text-field.html number-reframe-anon-text-field-ref.html
 
 == pseudo-classes.html about:blank
 
 # Style inheritance:
-== number-style-inheritance.html number-style-inheritance-ref.html
+pref(layout.css.moz-appearance.enabled,true) == number-style-inheritance.html number-style-inheritance-ref.html

--- a/layout/reftests/forms/progress/reftest.list
+++ b/layout/reftests/forms/progress/reftest.list
@@ -1,8 +1,11 @@
+# This enables '-moz-appearance' for author sheets:
+default-preferences pref(layout.css.moz-appearance.enabled,true)
+
 == values.html values-ref.html
 == values-rtl.html values-rtl-ref.html
 == margin-padding.html margin-padding-ref.html
 == margin-padding-rtl.html margin-padding-rtl-ref.html
 == bar-pseudo-element.html bar-pseudo-element-ref.html
 == bar-pseudo-element-rtl.html bar-pseudo-element-rtl-ref.html
 == indeterminate-style-width.html indeterminate-style-width-ref.html
 

--- a/layout/reftests/forms/textbox/reftest.list
+++ b/layout/reftests/forms/textbox/reftest.list
@@ -3,9 +3,9 @@
 skip-if(cocoaWidget||Android) != accesskey-1.xul accesskey-1-notref.xul
 skip-if(cocoaWidget||Android) == accesskey-2.xul accesskey-2-ref.xul
 # accesskey-3 fails because of defects in XUL bidi support
 fails-if(!cocoaWidget) skip-if(cocoaWidget||Android) == accesskey-3.xul accesskey-3-ref.xul
 skip-if(cocoaWidget||Android) != accesskey-3.xul accesskey-3-notref.xul
 skip-if(cocoaWidget||Android) == accesskey-4.xul accesskey-4-ref.xul
 skip-if(cocoaWidget||Android) != accesskey-4.xul accesskey-4-notref.xul
 skip-if(Android) == align-baseline-1.xul align-baseline-1-ref.xul # test for bug 494901
-skip-if(Android) == setsize.xul setsize-ref.xul
+pref(layout.css.moz-appearance.enabled,true) skip-if(Android) == setsize.xul setsize-ref.xul

--- a/layout/reftests/native-theme/reftest.list
+++ b/layout/reftests/native-theme/reftest.list
@@ -25,21 +25,21 @@ fails-if(!nativeThemePref) != radio-nati
 == radio-still-native-when-styled.html radio-still-native-when-styled-ref.html
 fails-if(!nativeThemePref) != checkbox-native.html checkbox-nonnative.html
 == checkbox-still-native-when-styled.html checkbox-still-native-when-styled-ref.html
 == native-theme-disabled-cascade-levels.html native-theme-disabled-cascade-levels-ref.html
 
 != 427122-1.html 427122-1-ref.html
 
 # 403458 is a Windows-only bug
-skip-if(!winWidget) != 403458-winmenu-ltr.xul 403458-winmenu-rtl.xul
+pref(layout.css.moz-appearance.enabled,true) skip-if(!winWidget) != 403458-winmenu-ltr.xul 403458-winmenu-rtl.xul
 
 == 470711-1.xul 470711-1-ref.xul
 
-== 482955-1.xul 482955-1-ref.xul
+pref(layout.css.moz-appearance.enabled,true) == 482955-1.xul 482955-1-ref.xul
 
 == 492155-1.html about:blank
 == 492155-2.html about:blank
 == 492155-3.html about:blank
 fails-if(Android&&!asyncPan) != 492155-4.html about:blank
 
 != box-shadow-input.html box-shadow-input-ref.html
 != box-shadow-button.html box-shadow-button-ref.html
@@ -73,12 +73,12 @@ skip-if(!winWidget) == scroll-thumb-mini
 
 == checkbox-dynamic-1.html checkbox-dynamic-1-ref.html
 
 # These tests have been written to test the overflow of the window widget
 # (bug 568825) but we can't test it on Windows and Cocoa because they have
 # animated progress bars.
 # Nothing shows up on Android, presumably because that appearance type is
 # not implemented.
-skip-if(cocoaWidget) skip-if(winWidget) == progress-overflow.html progress-overflow-ref.html
-fails-if(Android) skip-if(cocoaWidget) skip-if(winWidget) != progress-overflow-small.html progress-nobar.html
+pref(layout.css.moz-appearance.enabled,true) skip-if(cocoaWidget) skip-if(winWidget) == progress-overflow.html progress-overflow-ref.html
+pref(layout.css.moz-appearance.enabled,true) fails-if(Android) skip-if(cocoaWidget) skip-if(winWidget) != progress-overflow-small.html progress-nobar.html
 
 == 676387-1.xul 676387-1-ref.xul

--- a/layout/reftests/svg/reftest.list
+++ b/layout/reftests/svg/reftest.list
@@ -209,17 +209,17 @@ fuzzy-if(skiaContent,1,500) == filter-sc
 == filter-use-element-01.svg pass.svg
 fuzzy-if(skiaContent,1,800000) == filters-and-group-opacity-01.svg filters-and-group-opacity-01-ref.svg
 
 == foreignObject-01.svg pass.svg
 == foreignObject-02.svg foreignObject-02-ref.svg
 == foreignObject-ancestor-style-change-01.svg foreignObject-ancestor-style-change-01-ref.svg
 == foreignObject-change-transform-01.svg pass.svg
 == foreignObject-display-01.svg pass.svg
-== foreignObject-form-theme.svg foreignObject-form-theme-ref.html
+pref(layout.css.moz-appearance.enabled,true) == foreignObject-form-theme.svg foreignObject-form-theme-ref.html
 == foreignObject-img-form-theme.html foreignObject-img-form-theme-ref.html
 == foreignObject-move-repaint-01.svg pass.svg
 == foreignObject-overflow-01.svg pass.svg
 == foreignObject-start-hidden-01.svg pass.svg # followup from Bug 596765
 == foreignObject-start-hidden-02.svg pass.svg
 == foreignObject-style-change-01.svg pass.svg
 == foreignObject-dynamic-abspos-01.html foreignObject-dynamic-abspos-01-ref.html
 fuzzy-if(Android,18,600) == foreignObject-fixedpos-01.html foreignObject-dynamic-abspos-01-ref.html

--- a/layout/reftests/writing-mode/reftest.list
+++ b/layout/reftests/writing-mode/reftest.list
@@ -64,17 +64,17 @@ fuzzy(116,94) fuzzy-if(winWidget,135,124
 == ua-style-sheet-fieldset-1.html ua-style-sheet-fieldset-1-ref.html
 skip-if(Android||winWidget) == ua-style-sheet-textarea-1.html ua-style-sheet-textarea-1a-ref.html
 skip-if(!(Android)) == ua-style-sheet-textarea-1.html ua-style-sheet-textarea-1b-ref.html
 skip-if(!winWidget) == ua-style-sheet-textarea-1.html ua-style-sheet-textarea-1c-ref.html
 fuzzy-if(Android,1,18) == ua-style-sheet-checkbox-radio-1.html ua-style-sheet-checkbox-radio-1-ref.html
 skip-if(Android) fuzzy-if(skiaContent&&!Android,2,6) == ua-style-sheet-button-1.html ua-style-sheet-button-1a-ref.html
 skip-if(!(Android)) == ua-style-sheet-button-1.html ua-style-sheet-button-1b-ref.html
 == ua-style-sheet-input-color-1.html ua-style-sheet-input-color-1-ref.html
-fuzzy-if(gtkWidget,1,15) == ua-style-sheet-input-number-1.html ua-style-sheet-input-number-1-ref.html
+pref(layout.css.moz-appearance.enabled,true) fuzzy-if(gtkWidget,1,15) == ua-style-sheet-input-number-1.html ua-style-sheet-input-number-1-ref.html
 
 HTTP(..) == 1127488-align-default-horizontal-tb-ltr.html 1127488-align-top-left-ref.html
 HTTP(..) == 1127488-align-start-horizontal-tb-ltr.html 1127488-align-top-left-ref.html
 HTTP(..) == 1127488-align-end-horizontal-tb-ltr.html 1127488-align-top-right-ref.html
 HTTP(..) == 1127488-align-left-horizontal-tb-ltr.html 1127488-align-top-left-ref.html
 HTTP(..) == 1127488-align-right-horizontal-tb-ltr.html 1127488-align-top-right-ref.html
 HTTP(..) == 1127488-align-default-horizontal-tb-rtl.html 1127488-align-top-right-ref.html
 HTTP(..) == 1127488-align-start-horizontal-tb-rtl.html 1127488-align-top-right-ref.html

--- a/layout/reftests/writing-mode/ua-style-sheet-input-number-1-ref.html
+++ b/layout/reftests/writing-mode/ua-style-sheet-input-number-1-ref.html
@@ -1,17 +1,17 @@
 <!DOCTYPE html>
 <meta charset=utf-8>
 <title>Test for logical properties of input type=number in the UA stylesheet</title>
 <style>
 .v-rl { writing-mode: vertical-rl; }
 .ltr, .rtl, .v-rl { border: 1px solid blue; }
 div { padding: 10px; }
 .a { -moz-appearance:textfield; }
-.b { -moz-appearance:none; appearance: none; }
+.b { -moz-appearance:none; }
 
 .ltr input[type="number"],
 .rtl input[type="number"] {
   width: 20ch;
 }
 
 .v-rl input[type="number"] {
   height: 20ch;

--- a/layout/reftests/writing-mode/ua-style-sheet-input-number-1.html
+++ b/layout/reftests/writing-mode/ua-style-sheet-input-number-1.html
@@ -1,17 +1,17 @@
 <!DOCTYPE html>
 <meta charset=utf-8>
 <title>Test for logical properties of input type=number in the UA stylesheet</title>
 <style>
 .v-rl { writing-mode: vertical-rl; }
 .ltr, .rtl, .v-rl { border: 1px solid blue; }
 div { padding: 10px; }
 .a { -moz-appearance:textfield; }
-.b { -moz-appearance:none; appearance: none; }
+.b { -moz-appearance:none; }
 </style>
 <div class=ltr>
   <input type=number value=123><br><br>
   <input type=number value=456 class=a><br><br>
   <input type=number value=7890 class=b>
 </div>
 
 <div class=rtl dir=rtl>

--- a/layout/svg/crashtests/crashtests.list
+++ b/layout/svg/crashtests/crashtests.list
@@ -69,17 +69,17 @@ load 402408-1.svg
 load 404677-1.xhtml
 load 409565-1.xhtml
 load 409573-1.svg
 load 420697-1.svg
 load 420697-2.svg
 load 429774-1.svg
 load 441368-1.svg
 load 453754-1.svg
-load 455314-1.xhtml
+pref(layout.css.moz-appearance.enabled,true) load 455314-1.xhtml
 load 458453.html
 load 459666-1.html # bug 1323652
 load 459883.xhtml
 load 461289-1.svg
 load 464374-1.svg
 load 466585-1.svg
 load 467323-1.svg
 load 467498-1.svg
@@ -148,17 +148,17 @@ load 780764-1.svg
 load 780963-1.html
 load 782141-1.svg
 load 784061-1.svg
 load 788831-1.svg
 load 789390-1.html # bug 1323652
 load 790072.svg
 load 791826-1.svg
 load 808318-1.svg
-load 803562-1.svg
+pref(layout.css.moz-appearance.enabled,true) load 803562-1.svg
 load 813420-1.svg
 load 841163-1.svg
 load 841812-1.svg
 load 842009-1.svg
 load 842630-1.svg
 load 842909-1.svg
 load 843072-1.svg
 load 843917-1.svg

--- a/layout/xul/reftest/reftest.list
+++ b/layout/xul/reftest/reftest.list
@@ -1,6 +1,6 @@
-fails-if(Android) == textbox-multiline-noresize.xul textbox-multiline-ref.xul # reference is blank on Android (due to no native theme support?)
-!= textbox-multiline-resize.xul textbox-multiline-ref.xul
+pref(layout.css.moz-appearance.enabled,true) fails-if(Android) == textbox-multiline-noresize.xul textbox-multiline-ref.xul # reference is blank on Android (due to no native theme support?)
+pref(layout.css.moz-appearance.enabled,true) != textbox-multiline-resize.xul textbox-multiline-ref.xul
 == popup-explicit-size.xul popup-explicit-size-ref.xul
 random-if(Android) == image-size.xul image-size-ref.xul
 == image-scaling-min-height-1.xul image-scaling-min-height-1-ref.xul
 == textbox-text-transform.xul textbox-text-transform-ref.xul

--- a/toolkit/content/tests/reftests/reftest.list
+++ b/toolkit/content/tests/reftests/reftest.list
@@ -1,3 +1,3 @@
-random-if(cocoaWidget) == bug-442419-progressmeter-max.xul bug-442419-progressmeter-max-ref.xul # fails most of the time on Mac because progress meter animates
+pref(layout.css.moz-appearance.enabled,true) random-if(cocoaWidget) == bug-442419-progressmeter-max.xul bug-442419-progressmeter-max-ref.xul # fails most of the time on Mac because progress meter animates
 != textbox-multiline-default-value.xul textbox-multiline-empty.xul
 == videocontrols-dynamically-add-cc.html videocontrols-dynamically-add-cc-ref.html

--- a/toolkit/themes/osx/reftests/reftest.list
+++ b/toolkit/themes/osx/reftests/reftest.list
@@ -1,5 +1,5 @@
-skip-if(!cocoaWidget) == 482681.xul 482681-ref.xul
-skip-if(!cocoaWidget) == radiosize.xul radiosize-ref.xul
-skip-if(!cocoaWidget) == checkboxsize.xul checkboxsize-ref.xul
+pref(layout.css.moz-appearance.enabled,true) skip-if(!cocoaWidget) == 482681.xul 482681-ref.xul
+pref(layout.css.moz-appearance.enabled,true) skip-if(!cocoaWidget) == radiosize.xul radiosize-ref.xul
+pref(layout.css.moz-appearance.enabled,true) skip-if(!cocoaWidget) == checkboxsize.xul checkboxsize-ref.xul
 skip-if(!cocoaWidget) == baseline.xul about:blank
 skip-if(!cocoaWidget) == nostretch.xul nostretch-ref.xul

--- a/view/crashtests/crashtests.list
+++ b/view/crashtests/crashtests.list
@@ -1,9 +1,9 @@
 load 38589-1.xul
 load 64049-1.html
 load 281743-1.html
 load 323497-1.html
-load 382756-1.xul
+pref(layout.css.moz-appearance.enabled,true) load 382756-1.xul
 load 387745-1.svg
 load 399852.html
 load 429315-1.html
 load 507563-1.html

--- a/widget/cocoa/crashtests/crashtests.list
+++ b/widget/cocoa/crashtests/crashtests.list
@@ -1,11 +1,11 @@
 skip-if(!cocoaWidget) load 373122-1.html # bug 1300017
 load 397209-1.html
 load 403296-1.xhtml
-load 419737-1.html
-load 435223-1.html
+pref(layout.css.moz-appearance.enabled,true) load 419737-1.html
+pref(layout.css.moz-appearance.enabled,true) load 435223-1.html
 load 444260-1.xul
 load 444864-1.html
 load 449111-1.html
-load 460349-1.xhtml
-load 460387-1.html
+pref(layout.css.moz-appearance.enabled,true) load 460349-1.xhtml
+pref(layout.css.moz-appearance.enabled,true) load 460387-1.html
 load 464589-1.html

--- a/widget/crashtests/crashtests.list
+++ b/widget/crashtests/crashtests.list
@@ -1,4 +1,4 @@
 load 303901-1.html
 load 303901-2.html
-load 380359-1.xhtml
+pref(layout.css.moz-appearance.enabled,true) load 380359-1.xhtml
 load 1128214.html

--- a/widget/gtk/crashtests/crashtests.list
+++ b/widget/gtk/crashtests/crashtests.list
@@ -1,2 +1,2 @@
-load 540078-1.xhtml
+pref(layout.css.moz-appearance.enabled,true) load 540078-1.xhtml
 load 673390-1.html

--- a/widget/reftests/reftest.list
+++ b/widget/reftests/reftest.list
@@ -1,6 +1,6 @@
-skip-if(!cocoaWidget) != 507947.html about:blank
-== progressbar-fallback-default-style.html progressbar-fallback-default-style-ref.html
+pref(layout.css.moz-appearance.enabled,true) skip-if(!cocoaWidget) != 507947.html about:blank
+pref(layout.css.moz-appearance.enabled,true) == progressbar-fallback-default-style.html progressbar-fallback-default-style-ref.html
 fuzzy-if(Android,17,1120) == meter-native-style.html meter-native-style-ref.html
 skip-if(!cocoaWidget) == meter-vertical-native-style.html meter-vertical-native-style-ref.html # dithering
-== meter-fallback-default-style.html meter-fallback-default-style-ref.html
-load 664925.xhtml
+pref(layout.css.moz-appearance.enabled,true) == meter-fallback-default-style.html meter-fallback-default-style-ref.html
+pref(layout.css.moz-appearance.enabled,true) load 664925.xhtml