diff --git a/dom/canvas/test/webgl-conf/generated-mochitest.ini b/dom/canvas/test/webgl-conf/generated-mochitest.ini
index 1545cceb3fd5..11f11f4b9239 100644
--- a/dom/canvas/test/webgl-conf/generated-mochitest.ini
+++ b/dom/canvas/test/webgl-conf/generated-mochitest.ini
@@ -7615,7 +7615,6 @@ skip-if = (os == 'win')
 [generated/test_conformance__extensions__webgl-debug-shaders.html]
 [generated/test_conformance__extensions__webgl-depth-texture.html]
 [generated/test_conformance__extensions__webgl-draw-buffers-framebuffer-unsupported.html]
-fail-if = (os == 'mac') || (os == 'linux')
 [generated/test_conformance__extensions__webgl-draw-buffers-max-draw-buffers.html]
 [generated/test_conformance__extensions__webgl-draw-buffers.html]
 skip-if = (os == 'linux')
diff --git a/dom/canvas/test/webgl-conf/mochitest-errata.ini b/dom/canvas/test/webgl-conf/mochitest-errata.ini
index 1907b8f75f93..f709e945f993 100644
--- a/dom/canvas/test/webgl-conf/mochitest-errata.ini
+++ b/dom/canvas/test/webgl-conf/mochitest-errata.ini
@@ -193,8 +193,6 @@ skip-if = (os == 'android')
 fail-if = (os == 'android') || (os == 'linux') || (os == 'win') || (os == 'mac')
 [generated/test_conformance__extensions__oes-texture-half-float-with-video.html]
 fail-if = (os == 'mac') || (os == 'android') || (os == 'linux') || (os == 'win')
-[generated/test_conformance__extensions__webgl-draw-buffers-framebuffer-unsupported.html]
-fail-if = (os == 'mac') || (os == 'linux')
 [generated/test_conformance__textures__video__tex-2d-rgb-rgb-unsigned_byte.html]
 fail-if = (os == 'android') || (os == 'linux') || (os == 'mac') || (os == 'win')
 [generated/test_conformance__textures__video__tex-2d-rgb-rgb-unsigned_short_5_6_5.html]