diff --git a/dom/media/test/reftest/reftest.list b/dom/media/test/reftest/reftest.list
index c551ce964d3f..77954a46e60f 100644
--- a/dom/media/test/reftest/reftest.list
+++ b/dom/media/test/reftest/reftest.list
@@ -1,3 +1,3 @@
-skip-if(Android) fuzzy-if(OSX,22,49977) skip-if(winWidget) fuzzy-if(webrender,70,600) HTTP(..) == short.mp4.firstframe.html short.mp4.firstframe-ref.html
-skip-if(Android) fuzzy-if(OSX,23,51392) fuzzy-if(winWidget,59,76797) fuzzy-if(webrender,60,1800) HTTP(..) == short.mp4.lastframe.html short.mp4.lastframe-ref.html
-skip-if(Android) skip-if(winWidget) fuzzy-if(webrender,55,4281) fuzzy-if(OSX,3,111852) HTTP(..) == bipbop_300_215kbps.mp4.lastframe.html bipbop_300_215kbps.mp4.lastframe-ref.html
\ No newline at end of file
+skip-if(Android) fuzzy-if(OSX,22,49977) skip-if(winWidget) fuzzy-if(gtkWidget&&layersGPUAccelerated,70,600) HTTP(..) == short.mp4.firstframe.html short.mp4.firstframe-ref.html
+skip-if(Android) fuzzy-if(OSX,23,51392) fuzzy-if(winWidget,59,76797) fuzzy-if(gtkWidget&&layersGPUAccelerated,60,1800) HTTP(..) == short.mp4.lastframe.html short.mp4.lastframe-ref.html
+skip-if(Android) skip-if(winWidget) fuzzy-if(gtkWidget&&layersGPUAccelerated,55,4281) fuzzy-if(OSX,3,111852) HTTP(..) == bipbop_300_215kbps.mp4.lastframe.html bipbop_300_215kbps.mp4.lastframe-ref.html
diff --git a/testing/mozharness/configs/unittests/linux_unittest.py b/testing/mozharness/configs/unittests/linux_unittest.py
index c8d33851c704..eeee3d279d60 100644
--- a/testing/mozharness/configs/unittests/linux_unittest.py
+++ b/testing/mozharness/configs/unittests/linux_unittest.py
@@ -222,7 +222,8 @@ config = {
             "tests": ["tests/jsreftest/tests/jstests.list"]
         },
         "reftest": {
-            "options": ["--suite=reftest"],
+            "options": ["--suite=reftest",
+                        "--setpref=layers.acceleration.force-enabled=true"],
             "tests": ["tests/reftest/tests/layout/reftests/reftest.list"]
         },
         "reftest-no-accel": {