diff --git a/layout/reftests/backgrounds/reftest.list b/layout/reftests/backgrounds/reftest.list
index c81509d2f5eb..9c1e3490b362 100644
--- a/layout/reftests/backgrounds/reftest.list
+++ b/layout/reftests/backgrounds/reftest.list
@@ -169,7 +169,7 @@ fuzzy(0-50,0-500) fuzzy-if(skiaContent,0-51,0-320) == attachment-local-clipping-
 # The next three tests are fuzzy due to bug 1128229.
 fuzzy(0-16,0-69) fuzzy-if(skiaContent,0-95,0-2206) == attachment-local-clipping-image-4.html attachment-local-clipping-image-4-ref.html
 fuzzy(0-16,0-69) fuzzy-if(skiaContent,0-95,0-2206) == attachment-local-clipping-image-5.html attachment-local-clipping-image-4-ref.html
-fuzzy(0-80,0-500) fuzzy-if(skiaContent,0-109,0-908) fuzzy-if(geckoview&&webrender,64-64,2010-2830) == attachment-local-clipping-image-6.html attachment-local-clipping-image-6-ref.html
+fuzzy(0-80,0-500) fuzzy-if(skiaContent,0-109,0-908) fuzzy-if(geckoview&&webrender&&device,64-64,2010-2830) == attachment-local-clipping-image-6.html attachment-local-clipping-image-6-ref.html
 
 fuzzy-if(skiaContent,0-1,0-8) fuzzy-if(webrender,0-1,0-84) == background-multiple-with-border-radius.html background-multiple-with-border-radius-ref.html
 fuzzy-if(webrender,10-93,49600-49600) == background-repeat-large-area.html background-repeat-large-area-ref.html
diff --git a/layout/reftests/bidi/reftest.list b/layout/reftests/bidi/reftest.list
index 5cfbc94c2f30..35a14f3d2738 100644
--- a/layout/reftests/bidi/reftest.list
+++ b/layout/reftests/bidi/reftest.list
@@ -158,7 +158,7 @@ random-if(/^Windows\x20NT\x206\.1/.test(http.oscpu)) == brackets-1a-ltr.html bra
 random-if(/^Windows\x20NT\x206\.1/.test(http.oscpu)) == brackets-1a-rtl.html brackets-1a-rtl-ref.html # Bug 1392106
 random-if(/^Windows\x20NT\x206\.1/.test(http.oscpu)) == brackets-1b-ltr.html brackets-1b-ltr-ref.html # Bug 1392106
 random-if(/^Windows\x20NT\x206\.1/.test(http.oscpu)) == brackets-1b-rtl.html brackets-1b-rtl-ref.html # Bug 1392106
-fuzzy-if(geckoview&&webrender,22-22,44-46) random-if(/^Windows\x20NT\x206\.1/.test(http.oscpu)) == brackets-1c-ltr.html brackets-1c-ltr-ref.html # Bug 1392106
+fuzzy-if(geckoview&&webrender&&device,22-22,44-46) fuzzy-if(geckoview&&webrender&&emulator,23-23,1-1) random-if(/^Windows\x20NT\x206\.1/.test(http.oscpu)) == brackets-1c-ltr.html brackets-1c-ltr-ref.html # Bug 1392106
 random-if(/^Windows\x20NT\x206\.1/.test(http.oscpu)) == brackets-1c-rtl.html brackets-1c-rtl-ref.html # Bug 1392106
 fuzzy-if(Android,0-1,0-6) random-if(/^Windows\x20NT\x206\.1/.test(http.oscpu)) == brackets-2a-ltr.html brackets-2a-ltr-ref.html # Bug 1392106
 fuzzy-if(cocoaWidget,0-1,0-2) fuzzy-if(Android,0-254,0-557) random-if(/^Windows\x20NT\x206\.1/.test(http.oscpu)) == brackets-2a-rtl.html brackets-2a-rtl-ref.html # Bug 1392106
diff --git a/layout/reftests/bugs/reftest.list b/layout/reftests/bugs/reftest.list
index c249215ca0ee..af7ffa191831 100644
--- a/layout/reftests/bugs/reftest.list
+++ b/layout/reftests/bugs/reftest.list
@@ -1157,7 +1157,7 @@ fails-if(usesRepeatResampling) fails-if(webrender&&!winWidget) == 446100-1e.html
 fails-if(usesRepeatResampling) fails-if(Android) fails-if(webrender&&!winWidget) == 446100-1g.html about:blank
 == 446100-1h.html about:blank
 == 447749-1.html 447749-1-ref.html
-fuzzy(0-127,0-2) fuzzy-if(geckoview&&webrender,43-43,4-4) == 448193.html 448193-ref.html
+fuzzy(0-127,0-2) fuzzy-if(geckoview&&webrender&&device,43-43,4-4) == 448193.html 448193-ref.html
 != 449149-1a.html about:blank
 != 449149-1b.html about:blank
 == 449149-2.html 449149-2-ref.html
@@ -1179,7 +1179,7 @@ fails-if(Android) == 455826-1.html 455826-1-ref.html
 fails-if(Android||cocoaWidget||winWidget) == chrome://reftest/content/bugs/456147.xul 456147-ref.html # bug 458047
 fuzzy-if(Android,0-11,0-41) fuzzy-if(winWidget||gtkWidget,0-4,0-6) fuzzy-if(d2d,0-16,0-95) fuzzy-if(skiaContent,0-42,0-154) fuzzy-if(webrender,56-60,449-528) == 456219-1a.html 456219-1-ref.html # bug 1128229
 fuzzy-if(Android,0-11,0-41) fuzzy-if(winWidget||gtkWidget,0-4,0-6) fuzzy-if(d2d,0-16,0-99) fuzzy-if(skiaContent,0-42,0-154) fuzzy-if(webrender,56-60,449-528) == 456219-1b.html 456219-1-ref.html # bug 1128229
-fuzzy-if(Android,0-11,0-41) fuzzy-if(winWidget||gtkWidget,0-4,0-6) fuzzy-if(d2d,0-16,0-99) fuzzy-if(skiaContent,0-42,0-154) fuzzy-if(webrender,56-60,449-497) fuzzy-if(geckoview&&webrender,60-60,1014-4421) == 456219-1c.html 456219-1-ref.html # bug 1128229
+fuzzy-if(Android,0-11,0-41) fuzzy-if(winWidget||gtkWidget,0-4,0-6) fuzzy-if(d2d,0-16,0-99) fuzzy-if(skiaContent,0-42,0-154) fuzzy-if(webrender,56-60,449-497) fuzzy-if(geckoview&&webrender&&device,60-60,1014-4421) == 456219-1c.html 456219-1-ref.html # bug 1128229
 fuzzy-if(skiaContent,0-1,0-45) fuzzy-if(webrender,9-9,8-8) == 456219-2.html 456219-2-ref.html
 == 456330-1.gif 456330-1-ref.png
 == 456484-1.html 456484-1-ref.html
@@ -1208,7 +1208,7 @@ fuzzy-if(skiaContent,0-1,0-5) == 459443-1.html 459443-1-ref.html
 == 459613-1.html 459613-1-ref.html
 == 460012-1.html 460012-1-ref.html
 == 461266-1.html 461266-1-ref.html
-fuzzy-if(skiaContent||webrender,0-1,0-31200) fails-if(geckoview&&webrender) == 461512-1.html 461512-1-ref.html
+fuzzy-if(skiaContent||webrender,0-1,0-31200) fails-if(geckoview&&webrender&&device) == 461512-1.html 461512-1-ref.html
 == 462844-1.html 462844-ref.html
 == 462844-2.html 462844-ref.html
 == 462844-3.html 462844-ref.html
@@ -1588,7 +1588,7 @@ fuzzy-if(Android,0-8,0-20) fails-if(webrender) == 602200-3.html 602200-3-ref.htm
 == 602200-4.html 602200-4-ref.html
 == 603423-1.html 603423-1-ref.html
 == 604737.html 604737-ref.html
-fuzzy-if(webrender&&cocoaWidget,0-7,0-610) == 605138-1.html 605138-1-ref.html
+fuzzy-if(webrender&&cocoaWidget,0-7,0-610) fuzzy-if(geckoview&&webrender&&emulator,0-11,0-632) == 605138-1.html 605138-1-ref.html
 == 605157-1.xhtml 605157-1-ref.xhtml
 == 607267-1.html 607267-1-ref.html
 == 608636-1.html 608636-1-ref.html
@@ -1709,7 +1709,7 @@ fuzzy-if(skiaContent,0-1,0-1) == 751012-1b.html 751012-1-ref.html
 == 753329-1.html about:blank
 == 758561-1.html 758561-1-ref.html
 fuzzy-if(true,0-1,0-90) fuzzy-if(skiaContent,0-1,0-320) == 759036-1.html 759036-1-ref.html
-fuzzy-if(true,0-17,0-5886) fuzzy-if(skiaContent,0-9,0-5894) fuzzy-if(geckoview&&webrender,3-3,5897-5897) == 759036-2.html 759036-2-ref.html
+fuzzy-if(true,0-17,0-5886) fuzzy-if(skiaContent,0-9,0-5894) fuzzy-if(geckoview&&webrender&&device,3-3,5897-5897) == 759036-2.html 759036-2-ref.html
 == 776265-1a.html 776265-1-ref.html
 == 776265-1b.html 776265-1-ref.html
 == 776265-1c.html 776265-1-ref.html
diff --git a/layout/reftests/css-blending/reftest.list b/layout/reftests/css-blending/reftest.list
index 227a511ec75f..d2665a68d894 100644
--- a/layout/reftests/css-blending/reftest.list
+++ b/layout/reftests/css-blending/reftest.list
@@ -2,7 +2,7 @@
 == blend-constant-background-color.html blend-constant-background-color-ref.html
 == blend-gradient-background-color.html blend-gradient-background-color-ref.html
 == blend-image.html blend-image-ref.html
-fuzzy-if(geckoview&&webrender,3-3,5-5) == blend-difference-stacking.html blend-difference-stacking-ref.html
+fuzzy-if(geckoview&&webrender&&device,3-3,5-5) == blend-difference-stacking.html blend-difference-stacking-ref.html
 
 fuzzy-if(/^Windows\x20NT\x2010\.0/.test(http.oscpu),0-1,0-10000) fuzzy-if(skiaContent,0-1,0-30000) == background-blending-alpha.html background-blending-alpha-ref.html
 == background-blending-gradient-color.html background-blending-gradient-color-ref.html
@@ -38,12 +38,12 @@ fuzzy-if(d2d||azureSkia||gtkWidget,0-10,0-4800) == background-blending-soft-ligh
 fuzzy-if(azureSkia||d2d||gtkWidget,0-1,0-40000) == background-blending-image-color-959674.html background-blending-image-color-959674-ref.html
 
 #fuzzy due to inconsistencies in rounded rect cliping between parent and child; may be related to antialiasing. Between platforms, the max difference is the same, and the number of different pixels is either 36 or 37. (Win, Mac and Lin)
-fuzzy(0-65,0-53) fuzzy-if(geckoview&&webrender,63-64,163-328) == mix-blend-mode-952051.html mix-blend-mode-952051-ref.html
+fuzzy(0-65,0-53) fuzzy-if(geckoview&&webrender&&device,63-64,163-328) == mix-blend-mode-952051.html mix-blend-mode-952051-ref.html
 
 fuzzy-if(d3d11,0-49,0-200) == mix-blend-mode-and-filter.html mix-blend-mode-and-filter-ref.html
 fuzzy-if(d3d11,0-1,0-5) == mix-blend-mode-and-filter.svg mix-blend-mode-and-filter-ref.svg
 
-fuzzy(0-2,0-14400) fuzzy-if(geckoview&&webrender,3-3,700-700) == mix-blend-mode-child-of-blended-has-opacity.html mix-blend-mode-child-of-blended-has-opacity-ref.html
+fuzzy(0-2,0-14400) fuzzy-if(geckoview&&webrender&&device,3-3,700-700) == mix-blend-mode-child-of-blended-has-opacity.html mix-blend-mode-child-of-blended-has-opacity-ref.html
 
 == mix-blend-mode-nested-976533.html mix-blend-mode-nested-976533-ref.html
 == mix-blend-mode-culling-1207041.html mix-blend-mode-culling-1207041-ref.html
diff --git a/layout/reftests/forms/fieldset/reftest.list b/layout/reftests/forms/fieldset/reftest.list
index f7d8e0f1badc..b498b2842208 100644
--- a/layout/reftests/forms/fieldset/reftest.list
+++ b/layout/reftests/forms/fieldset/reftest.list
@@ -12,7 +12,7 @@ fuzzy-if(winWidget&&!layersGPUAccelerated,0-142,0-276) == positioned-container-1
 == relpos-legend-4.html relpos-legend-4-ref.html
 == sticky-legend-1.html sticky-legend-1-ref.html
 fuzzy-if(skiaContent,0-1,0-40768) == abs-pos-child-sizing.html abs-pos-child-sizing-ref.html
-== overflow-hidden.html overflow-hidden-ref.html
+fuzzy-if(geckoview&&webrender&&emulator,0-4,0-7) == overflow-hidden.html overflow-hidden-ref.html
 == legend-rtl.html legend-rtl-ref.html
 == fieldset-grid-001.html fieldset-grid-001-ref.html
 == fieldset-flexbox-001.html fieldset-flexbox-001-ref.html
diff --git a/layout/reftests/mathml/reftest.list b/layout/reftests/mathml/reftest.list
index 5b7e5a9a4d4c..08ad4b7dfc1f 100644
--- a/layout/reftests/mathml/reftest.list
+++ b/layout/reftests/mathml/reftest.list
@@ -143,7 +143,7 @@ fails-if(skiaContent&&OSX>=1010) == scale-stretchy-3.xhtml scale-stretchy-3-ref.
 == mpadded-5.html mpadded-5-ref.html
 == mpadded-1-2.html mpadded-1-2-ref.html
 == mpadded-6.html mpadded-6-ref.html
-random-if(gtkWidget) fails-if(geckoview&&webrender) == mpadded-7.html mpadded-7-ref.html # bug 1309430
+random-if(gtkWidget) fails-if(geckoview&&webrender&&device) == mpadded-7.html mpadded-7-ref.html # bug 1309430
 random-if(gtkWidget) == mpadded-8.html mpadded-8-ref.html # bug 1309430
 random-if(gtkWidget) == mpadded-9.html mpadded-9-ref.html # bug 1309430
 == scriptlevel-1.html scriptlevel-1-ref.html
@@ -282,11 +282,11 @@ fuzzy-if(d2d,0-7,0-1) == menclose-6-updiagonalstrike.html menclose-6-ref.html
 == menclose-6-phasorangle.html menclose-6-ref.html
 == mmultiscript-align.html mmultiscript-align-ref.html
 fails-if(winWidget) == subscript-italic-correction.html subscript-italic-correction-ref.html # bug 961482
-fails-if(Android&&!webrender) random-if(/^Windows\x20NT\x206\.1/.test(http.oscpu)) == mathvariant-1a.html mathvariant-1a-ref.html # Bug 1010679, Bug 1392106
-fails-if(Android&&!webrender) random-if(/^Windows\x20NT\x206\.1/.test(http.oscpu)) == mathvariant-1b.html mathvariant-1b-ref.html # Bug 1010679, Bug 1392106
-fails-if(Android&&!webrender) random-if(/^Windows\x20NT\x206\.1/.test(http.oscpu)) == mathvariant-1c.html mathvariant-1c-ref.html # Bug 1010679, Bug 1392106
+fails-if(Android&&emulator) random-if(/^Windows\x20NT\x206\.1/.test(http.oscpu)) == mathvariant-1a.html mathvariant-1a-ref.html # Bug 1010679, Bug 1392106
+fails-if(Android&&emulator) random-if(/^Windows\x20NT\x206\.1/.test(http.oscpu)) == mathvariant-1b.html mathvariant-1b-ref.html # Bug 1010679, Bug 1392106
+fails-if(Android&&emulator) random-if(/^Windows\x20NT\x206\.1/.test(http.oscpu)) == mathvariant-1c.html mathvariant-1c-ref.html # Bug 1010679, Bug 1392106
 == mathvariant-1d.html mathvariant-1d-ref.html
-fails-if(Android&&!webrender) fails-if(OSX) == mathvariant-2.html mathvariant-2-ref.html # Bugs 1010678, 1010679
+fails-if(Android&&emulator) fails-if(OSX) == mathvariant-2.html mathvariant-2-ref.html # Bugs 1010678, 1010679
 pref(mathml.deprecated_style_attributes.disabled,false) == mathvariant-3.html mathvariant-3-ref.html
 == mathvariant-4.html mathvariant-4-ref.html
 pref(mathml.deprecated_style_attributes.disabled,false) == mathvariant-5.html mathvariant-5-ref.html
diff --git a/layout/reftests/reftest-sanity/reftest.list b/layout/reftests/reftest-sanity/reftest.list
index ed87d71a305e..320e3268d600 100644
--- a/layout/reftests/reftest-sanity/reftest.list
+++ b/layout/reftests/reftest-sanity/reftest.list
@@ -39,8 +39,8 @@ HTTP == data:text/html,<div>Text</div> default.html
 != blank.html default.html
 HTTP != blank.html default.html
 
-fails-if(geckoview&&webrender) == filter-1.xhtml filter-1-ref.xhtml
-fails-if(geckoview&&webrender) == filter-2.xhtml filter-2-ref.xhtml
+fails-if(geckoview&&webrender&&device) == filter-1.xhtml filter-1-ref.xhtml
+fails-if(geckoview&&webrender&&device) == filter-2.xhtml filter-2-ref.xhtml
 
 # test that the MozReftestInvalidate event fires
 == invalidation.html about:blank
diff --git a/layout/reftests/svg/reftest.list b/layout/reftests/svg/reftest.list
index 1cf0bf12470a..858a1311f2f7 100644
--- a/layout/reftests/svg/reftest.list
+++ b/layout/reftests/svg/reftest.list
@@ -31,8 +31,8 @@ include svg-integration/reftest.list
 
 == baseline-middle-01.svg pass.svg
 
-fails-if(Android&&webrender) == blend-color-burn.svg blend-color-burn-ref.svg
-fails-if(Android&&webrender) == blend-color-dodge.svg blend-color-dodge-ref.svg
+fails-if(Android&&webrender&&device) == blend-color-burn.svg blend-color-burn-ref.svg
+fails-if(Android&&webrender&&device) == blend-color-dodge.svg blend-color-dodge-ref.svg
 # == blend-color.svg blend-color-ref.svg
 random-if(Android&&webrender) == blend-darken.svg blend-darken-ref.svg
 random-if(Android&&webrender) == blend-difference.svg blend-difference-ref.svg
diff --git a/layout/reftests/text-stroke/reftest.list b/layout/reftests/text-stroke/reftest.list
index 6bda24d4d79e..9ad93339c72c 100644
--- a/layout/reftests/text-stroke/reftest.list
+++ b/layout/reftests/text-stroke/reftest.list
@@ -4,6 +4,6 @@
 fuzzy(0-64,0-52) fails-if(gtkWidget&&!webrender) fuzzy-if(webrender,0-64,0-776) == webkit-text-stroke-property-001.html webkit-text-stroke-property-001-ref.html
 fuzzy(0-4,0-24) fails-if(gtkWidget&&!webrender) fuzzy-if(webrender,0-4,0-27) fuzzy-if(geckoview&&webrender,0-4,0-1476) == webkit-text-stroke-property-002.html webkit-text-stroke-property-002-ref.html
 fuzzy(0-48,0-28) fails-if(gtkWidget&&!webrender) fuzzy-if(webrender,0-64,0-346) == webkit-text-stroke-property-003.html webkit-text-stroke-property-003-ref.html
-fuzzy(0-64,0-33) fails-if(gtkWidget&&!webrender) fuzzy-if(webrender,0-64,0-575) fuzzy-if(geckoview&&webrender,0-64,0-599) == webkit-text-stroke-property-004.html webkit-text-stroke-property-004-ref.html
+fuzzy(0-64,0-33) fails-if(gtkWidget&&!webrender) fuzzy-if(webrender,0-64,0-575) fuzzy-if(geckoview&&webrender&&device,0-64,0-599) fuzzy-if(geckoview&&webrender&&emulator,96-96,58-58) == webkit-text-stroke-property-004.html webkit-text-stroke-property-004-ref.html
 fuzzy(0-64,0-47) fails-if(gtkWidget&&!webrender) fuzzy-if(webrender,0-64,0-860) == webkit-text-stroke-property-005.html webkit-text-stroke-property-005-ref.html
 fuzzy(0-71,0-10) fails-if(gtkWidget&&!webrender) == webkit-text-stroke-property-006.html webkit-text-stroke-property-006-ref.html
diff --git a/layout/reftests/usercss/reftest.list b/layout/reftests/usercss/reftest.list
index e4fdcaf036f5..5c0cbe9dfe07 100644
--- a/layout/reftests/usercss/reftest.list
+++ b/layout/reftests/usercss/reftest.list
@@ -1,3 +1,3 @@
 == usercss.html usercss-ref.html
 == usercss-uppercase.html usercss-ref.html
-fails-if(geckoview&&webrender) == usercss-moz-document.html usercss-moz-document-ref.html
+fails-if(geckoview&&webrender&&device) == usercss-moz-document.html usercss-moz-document-ref.html
diff --git a/layout/reftests/webkit-box/reftest.list b/layout/reftests/webkit-box/reftest.list
index 5dac46b7d75f..c9e9809c4f68 100644
--- a/layout/reftests/webkit-box/reftest.list
+++ b/layout/reftests/webkit-box/reftest.list
@@ -10,7 +10,7 @@
 # rendering.) We could probably make them pass by implementing some quirks, if
 # it turns out that the web depends on WebKit/Blink's behavior in these cases.
 random-if(/^Windows\x20NT\x206\.1/.test(http.oscpu)) == webkit-box-anon-flex-items-1a.html webkit-box-anon-flex-items-1-ref.html # Bug 1392106
-random-if(/^Windows\x20NT\x206\.1/.test(http.oscpu)) fuzzy-if(geckoview&&webrender,150-150,7-7) == webkit-box-anon-flex-items-1b.html webkit-box-anon-flex-items-1-ref.html # Bug 1392106
+random-if(/^Windows\x20NT\x206\.1/.test(http.oscpu)) fuzzy-if(geckoview&&webrender,150-151,5-7) == webkit-box-anon-flex-items-1b.html webkit-box-anon-flex-items-1-ref.html # Bug 1392106
 fails == webkit-box-anon-flex-items-2.html webkit-box-anon-flex-items-2-ref.html
 fails == webkit-box-anon-flex-items-3.html webkit-box-anon-flex-items-3-ref.html