diff --git a/dom/canvas/test/webgl-conf/generated-mochitest.ini b/dom/canvas/test/webgl-conf/generated-mochitest.ini
index 2c8dc91df456..b0e64d8db9af 100644
--- a/dom/canvas/test/webgl-conf/generated-mochitest.ini
+++ b/dom/canvas/test/webgl-conf/generated-mochitest.ini
@@ -6206,7 +6206,6 @@ skip-if = (os == 'android' || os == 'linux')
 [generated/test_2_conformance__extensions__webgl-compressed-texture-atc.html]
 skip-if = (os == 'android' || os == 'linux')
 [generated/test_2_conformance__extensions__webgl-compressed-texture-etc.html]
-fail-if = (os == 'mac') || (os == 'win')
 skip-if = (os == 'android' || os == 'linux')
 [generated/test_2_conformance__extensions__webgl-compressed-texture-pvrtc.html]
 skip-if = (os == 'android' || os == 'linux')
@@ -6215,7 +6214,7 @@ skip-if = (os == 'android' || os == 'linux')
 [generated/test_2_conformance__extensions__webgl-compressed-texture-s3tc.html]
 skip-if = (os == 'android' || os == 'linux')
 [generated/test_2_conformance__extensions__webgl-compressed-texture-size-limit.html]
-skip-if = (os == 'win') || (os == 'android' || os == 'linux')
+skip-if = (os == 'android' || os == 'linux')
 [generated/test_2_conformance__extensions__webgl-debug-renderer-info.html]
 skip-if = (os == 'android' || os == 'linux')
 [generated/test_2_conformance__extensions__webgl-debug-shaders.html]
@@ -7608,7 +7607,6 @@ fail-if = (os == 'mac') || (os == 'linux') || (os == 'win')
 [generated/test_conformance__extensions__webgl-compressed-texture-s3tc-srgb.html]
 [generated/test_conformance__extensions__webgl-compressed-texture-s3tc.html]
 [generated/test_conformance__extensions__webgl-compressed-texture-size-limit.html]
-skip-if = (os == 'win')
 [generated/test_conformance__extensions__webgl-debug-renderer-info.html]
 [generated/test_conformance__extensions__webgl-debug-shaders.html]
 [generated/test_conformance__extensions__webgl-depth-texture.html]
diff --git a/dom/canvas/test/webgl-conf/mochitest-errata.ini b/dom/canvas/test/webgl-conf/mochitest-errata.ini
index 287d8aaf7bc0..527e4fec8b14 100644
--- a/dom/canvas/test/webgl-conf/mochitest-errata.ini
+++ b/dom/canvas/test/webgl-conf/mochitest-errata.ini
@@ -327,8 +327,6 @@ fail-if = (os == 'mac') || (os == 'win')
 fail-if = (os == 'mac') || (os == 'win')
 [generated/test_2_conformance2__textures__video__tex-3d-srgb8_alpha8-rgba-unsigned_byte.html]
 fail-if = (os == 'mac') || (os == 'win')
-[generated/test_2_conformance__extensions__webgl-compressed-texture-etc.html]
-fail-if = (os == 'mac') || (os == 'win')
 [generated/test_2_conformance__textures__video__tex-2d-rgb-rgb-unsigned_byte.html]
 fail-if = (os == 'mac') || (os == 'win')
 [generated/test_2_conformance__textures__video__tex-2d-rgb-rgb-unsigned_short_5_6_5.html]
@@ -865,9 +863,6 @@ skip-if = (os == 'win' && debug)
 [generated/test_conformance__textures__misc__tex-image-and-sub-image-2d-with-array-buffer-view.html]
 # time out crash
 skip-if = (os == 'win' && debug)
-[generated/test_conformance__extensions__webgl-compressed-texture-size-limit.html]
-# skip this because the result is not always pass
-skip-if = (os == 'win')
 [generated/test_2_conformance2__glsl3__loops-with-side-effects.html]
 # application crashed [@ nvoglv32.dll + 0x999512]
 skip-if = (os == 'win')
@@ -938,9 +933,6 @@ skip-if = (os == 'win' && os_version == '6.1')
 [generated/test_2_conformance__textures__misc__tex-image-and-sub-image-2d-with-array-buffer-view.html]
 # Failure on win7 but got passed on win7 vm
 skip-if = (os == 'win' && os_version == '6.1')
-[generated/test_2_conformance__extensions__webgl-compressed-texture-size-limit.html]
-# Test timed out.
-skip-if = (os == 'win')
 [generated/test_2_conformance2__textures__misc__tex-input-validation.html]
 skip-if = (os == 'win')
 [generated/test_2_conformance2__buffers__get-buffer-sub-data.html]