--- a/layout/reftests/box-shadow/reftest.list
+++ b/layout/reftests/box-shadow/reftest.list
@@ -6,17 +6,17 @@ random != boxshadow-blur-2.html boxshado
 == boxshadow-multiple.html boxshadow-multiple-ref.html
 == boxshadow-spread.html boxshadow-spread-ref.html
 == tableboxshadow-basic.html tableboxshadow-basic-ref.html
 == tableboxshadow-trshadow.html tableboxshadow-trshadow-ref.html
 == tableboxshadow-tdshadow.html tableboxshadow-tdshadow-ref.html
 == boxshadow-rounding.html boxshadow-rounding-ref.html
 # One uses old path, one uses WR box shadow.
 fails-if(Android) fuzzy-if(webrender,50,3310) == boxshadow-button.html boxshadow-button-ref.html
-fuzzy-if(OSX==1010,1,24) fuzzy-if(d2d,16,908) fuzzy-if(webrender,48,2040) == boxshadow-large-border-radius.html boxshadow-large-border-radius-ref.html # Bug 1209649
+fuzzy-if(OSX==1010,1,24) fuzzy-if(d2d,16,908) fuzzy-if(webrender,18,2160) == boxshadow-large-border-radius.html boxshadow-large-border-radius-ref.html # Bug 1209649
 
 fails-if(Android) == boxshadow-fileupload.html boxshadow-fileupload-ref.html
 fuzzy-if(skiaContent,13,28) == boxshadow-inner-basic.html boxshadow-inner-basic-ref.svg
 random-if(layersGPUAccelerated) == boxshadow-mixed.html boxshadow-mixed-ref.html
 random-if(d2d) fuzzy-if(skiaContent,1,100) fuzzy-if(webrender,127,3528) == boxshadow-rounded-spread.html boxshadow-rounded-spread-ref.html
 fuzzy-if(skiaContent,1,50) HTTP(..) == boxshadow-dynamic.xul boxshadow-dynamic-ref.xul
 random-if(d2d) fuzzy-if(webrender,1-1,16-16) == boxshadow-onecorner.html boxshadow-onecorner-ref.html
 random-if(d2d) fuzzy-if(webrender,1-1,26-26) == boxshadow-twocorners.html boxshadow-twocorners-ref.html

--- a/layout/reftests/columns/reftest.list
+++ b/layout/reftests/columns/reftest.list
@@ -1,16 +1,16 @@
 == basic-1.html basic-ref.html
 == pref-width-1a.html pref-width-1-ref.html
 == pref-width-1b.html pref-width-1-ref.html
 == pref-width-1c.html pref-width-1-ref.html
 == min-width-1a.html pref-width-1-ref.html
 == min-width-1b.html min-width-1-ref.html
 == min-width-1c.html min-width-1-ref.html
-fuzzy-if(webrender,255-255,37-37) == min-width-2.html min-width-2-ref.html
+fuzzy-if(webrender,1-1,35-35) == min-width-2.html min-width-2-ref.html
 == column-balancing-overflow-000.html column-balancing-overflow-000.ref.html
 == column-balancing-overflow-001.html column-balancing-overflow-000.ref.html
 == column-balancing-overflow-002.html column-balancing-overflow-002.ref.html
 == column-balancing-overflow-003.html column-balancing-overflow-003.ref.html
 == column-balancing-overflow-004.html column-balancing-overflow-004.ref.html
 fuzzy-if(webrender,126,364) == column-balancing-overflow-005.html column-balancing-overflow-005.ref.html
 == column-balancing-000.html column-balancing-000.ref.html
 == column-balancing-001.html column-balancing-000.ref.html

--- a/layout/reftests/css-break/reftest.list
+++ b/layout/reftests/css-break/reftest.list
@@ -1,12 +1,12 @@
 default-preferences pref(layout.css.box-decoration-break.enabled,true)
 
 == box-decoration-break-1.html box-decoration-break-1-ref.html
-fuzzy(1,20) fuzzy-if(skiaContent,1,700) fuzzy-if(webrender,5,450) == box-decoration-break-with-inset-box-shadow-1.html box-decoration-break-with-inset-box-shadow-1-ref.html
+fuzzy(1,20) fuzzy-if(skiaContent,1,700) fuzzy-if(webrender,4-4,3273-3273) == box-decoration-break-with-inset-box-shadow-1.html box-decoration-break-with-inset-box-shadow-1-ref.html
 fuzzy(16,460) fuzzy-if(Android,10,3673) fuzzy-if(skiaContent,57,374) == box-decoration-break-with-outset-box-shadow-1.html box-decoration-break-with-outset-box-shadow-1-ref.html
 random-if(!gtkWidget) HTTP(..) == box-decoration-break-border-image.html box-decoration-break-border-image-ref.html
 == box-decoration-break-block-border-padding.html box-decoration-break-block-border-padding-ref.html
 == box-decoration-break-block-margin.html box-decoration-break-block-margin-ref.html
 fuzzy-if(!Android,1,62) fuzzy-if(Android,8,6627) == box-decoration-break-first-letter.html box-decoration-break-first-letter-ref.html #Bug 1313773
 == box-decoration-break-with-bidi.html box-decoration-break-with-bidi-ref.html
 == box-decoration-break-bug-1235152.html box-decoration-break-bug-1235152-ref.html
 == box-decoration-break-bug-1249913.html box-decoration-break-bug-1249913-ref.html

--- a/layout/reftests/pixel-rounding/reftest.list
+++ b/layout/reftests/pixel-rounding/reftest.list
@@ -172,12 +172,12 @@ fuzzy-if(skiaContent,1,145) == rounded-b
 fuzzy-if(skiaContent,1,145) == rounded-background-color-width-left-6.html rounded-background-color-width-6.html
 
 == background-image-tiling.html background-image-tiling-ref.html
 
 != border-image-width-0.html border-image-width-10.html
 == border-image-width-4.html border-image-width-0.html
 == border-image-width-9.html border-image-width-0.html
 
-== iframe-1.html iframe-1-ref.html
+fails-if(webrender) == iframe-1.html iframe-1-ref.html  # bug 1374378 for webrender
 
 fails-if(styloVsGecko||stylo) == viewport-units-rounding-1.html viewport-units-rounding-1-ref.html
 == viewport-units-rounding-2.html about:blank

--- a/layout/reftests/w3c-css/submitted/images3/reftest.list
+++ b/layout/reftests/w3c-css/submitted/images3/reftest.list
@@ -166,22 +166,22 @@ fails-if(!styloVsGecko) == object-fit-fi
 == object-fit-scale-down-svg-005e.html object-fit-scale-down-svg-005-ref.html
 == object-fit-scale-down-svg-005i.html object-fit-scale-down-svg-005-ref.html
 == object-fit-scale-down-svg-005o.html object-fit-scale-down-svg-005-ref.html
 == object-fit-scale-down-svg-005p.html object-fit-scale-down-svg-005-ref.html
 == object-fit-scale-down-svg-006e.html object-fit-scale-down-svg-006-ref.html
 == object-fit-scale-down-svg-006i.html object-fit-scale-down-svg-006-ref.html
 == object-fit-scale-down-svg-006o.html object-fit-scale-down-svg-006-ref.html
 == object-fit-scale-down-svg-006p.html object-fit-scale-down-svg-006-ref.html
-fails-if(!styloVsGecko) == object-position-png-001c.html object-position-png-001-ref.html # bug 1105150
+fails-if(!styloVsGecko&&!webrender) == object-position-png-001c.html object-position-png-001-ref.html # bug 1105150
 == object-position-png-001e.html object-position-png-001-ref.html
 == object-position-png-001i.html object-position-png-001-ref.html
 == object-position-png-001o.html object-position-png-001-ref.html
 == object-position-png-001p.html object-position-png-001-ref.html
-fails-if(!styloVsGecko) == object-position-png-002c.html object-position-png-002-ref.html # bug 1105150
+fails-if(!styloVsGecko&&!webrender) == object-position-png-002c.html object-position-png-002-ref.html # bug 1105150
 == object-position-png-002e.html object-position-png-002-ref.html
 == object-position-png-002i.html object-position-png-002-ref.html
 == object-position-png-002o.html object-position-png-002-ref.html
 == object-position-png-002p.html object-position-png-002-ref.html
 fails-if(!styloVsGecko) == object-position-svg-001e.html object-position-svg-001-ref.html # bug 1103286
 == object-position-svg-001i.html object-position-svg-001-ref.html
 fails-if(!styloVsGecko) == object-position-svg-001o.html object-position-svg-001-ref.html # bug 1103286
 == object-position-svg-001p.html object-position-svg-001-ref.html