--- a/layout/reftests/bugs/reftest.list
+++ b/layout/reftests/bugs/reftest.list
@@ -1629,17 +1629,17 @@ needs-focus == 613433-1.html 613433-3-re
 needs-focus == 613433-2.html 613433-1-ref.html
 needs-focus == 613433-2.html 613433-2-ref.html
 needs-focus == 613433-2.html 613433-3-ref.html
 needs-focus == 613433-3.html 613433-1-ref.html
 needs-focus == 613433-3.html 613433-2-ref.html
 needs-focus == 613433-3.html 613433-3-ref.html
 == 614272-1.svg  614272-1-ref.svg
 HTTP(..) == 615121-1.html 615121-1-ref.html
-HTTP(..) != 615121-2.html 615121-2-notref.html
+fails-if(webrender) HTTP(..) != 615121-2.html 615121-2-notref.html
 == 617242-1.html 617242-1-ref.html
 != 618071.html 618071-notref.html
 == 619117-1.html 619117-1-ref.html
 HTTP(..) == 619511-1.html 619511-1-ref.html
 skip-if(Android) HTTP(..) == 621253-1-externalFilter.html 621253-1-ref.html
 skip-if(Android) == 621253-1-internalFilter.html 621253-1-ref.html
 HTTP(..) == 621253-2-externalFilter.html 621253-2-ref.html
 == 621253-2-internalFilter.html 621253-2-ref.html

--- a/layout/reftests/text/reftest.list
+++ b/layout/reftests/text/reftest.list
@@ -171,17 +171,17 @@ random-if(!winWidget) == arial-bold-lam-
 # in the 'cmap' will prevent the test font (without GSUB) being used.
 fails-if(cocoaWidget||Android) HTTP(..) == arabic-fallback-1.html arabic-fallback-1-ref.html
 fails-if(cocoaWidget||Android) HTTP(..) == arabic-fallback-2.html arabic-fallback-2-ref.html
 fails-if(cocoaWidget||Android) HTTP(..) == arabic-fallback-3.html arabic-fallback-3-ref.html
 fails-if(!cocoaWidget&&!Android) HTTP(..) != arabic-fallback-4.html arabic-fallback-4-notref.html
 == arabic-marks-1.html arabic-marks-1-ref.html
 == arabic-final-ligature-spacing.html arabic-final-ligature-spacing-ref.html
 # harfbuzz fallback mark stacking in the absence of GPOS:
-HTTP(..) != fallback-mark-stacking-1.html fallback-mark-stacking-1-notref.html
+fails-if(webrender) HTTP(..) != fallback-mark-stacking-1.html fallback-mark-stacking-1-notref.html
 
 == 726392-1.html 726392-1-ref.html
 == 726392-2.html 726392-2-ref.html
 == 726392-3.html 726392-3-ref.html
 == 745555-1.html 745555-1-ref.html
 == 745555-2.html 745555-2-ref.html
 == 820255.html 820255-ref.html
 HTTP(..) != 1170688.html 1170688-ref.html