--- a/content/canvas/test/webgl/failing_tests_linux.txt
+++ b/content/canvas/test/webgl/failing_tests_linux.txt
@@ -1,1 +1,27 @@
-
+conformance/buffer-offscreen-test.html
+conformance/drawingbuffer-static-canvas-test.html
+conformance/drawingbuffer-test.html
+conformance/framebuffer-object-attachment.html
+conformance/shaders/glsl-features/../../glsl-features.html?feature=abs-frag&reffs=shaders/glsl-features/abs-ref.frag&testfs=shaders/glsl-features/abs.frag
+conformance/shaders/glsl-features/../../glsl-features.html?feature=abs-vert-vec2&refvs=shaders/glsl-features/abs-vec2-ref.vert&testvs=shaders/glsl-features/abs-vec2.vert
+conformance/shaders/glsl-features/../../glsl-features.html?feature=abs-vert-vec3&refvs=shaders/glsl-features/abs-vec3-ref.vert&testvs=shaders/glsl-features/abs-vec3.vert
+conformance/shaders/glsl-features/../../glsl-features.html?feature=abs-vert-vec4&refvs=shaders/glsl-features/abs-vec4-ref.vert&testvs=shaders/glsl-features/abs-vec4.vert
+conformance/shaders/glsl-features/../../glsl-features.html?feature=sign-frag-vec4&reffs=shaders/glsl-features/sign-vec4-ref.frag&testfs=shaders/glsl-features/sign-vec4.frag
+conformance/shaders/glsl-features/../../glsl-features.html?feature=sign-vert-vec4&refvs=shaders/glsl-features/sign-vec4-ref.vert&testvs=shaders/glsl-features/sign-vec4.vert
+conformance/gl-get-active-attribute.html
+conformance/gl-getshadersource.html
+conformance/gl-uniform-bool.html
+conformance/glsl-conformance.html
+conformance/glsl-long-variable-names.html
+conformance/invalid-passed-params.html
+conformance/object-deletion-behaviour.html
+conformance/premultiplyalpha-test.html
+conformance/read-pixels-test.html
+conformance/uninitialized-test.html
+conformance/webgl-specific.html
+conformance/more/conformance/quickCheckAPI.html
+conformance/more/functions/copyTexImage2D.html
+conformance/more/functions/copyTexSubImage2D.html
+conformance/more/functions/deleteBufferBadArgs.html
+conformance/more/functions/texImage2DBadArgs.html
+conformance/more/functions/uniformfArrayLen1.html

--- a/content/canvas/test/webgl/failing_tests_mac.txt
+++ b/content/canvas/test/webgl/failing_tests_mac.txt
@@ -1,1 +1,24 @@
-
+conformance/buffer-offscreen-test.html
+conformance/context-attributes-alpha-depth-stencil-antialias.html
+conformance/drawingbuffer-static-canvas-test.html
+conformance/drawingbuffer-test.html
+conformance/framebuffer-object-attachment.html
+conformance/gl-getshadersource.html
+conformance/gl-object-get-calls.html
+conformance/glsl-conformance.html
+conformance/glsl-long-variable-names.html
+conformance/invalid-passed-params.html
+conformance/object-deletion-behaviour.html
+conformance/premultiplyalpha-test.html
+conformance/program-test.html
+conformance/read-pixels-test.html
+conformance/tex-input-validation.html
+conformance/texture-npot.html
+conformance/webgl-specific.html
+conformance/more/conformance/quickCheckAPI.html
+conformance/more/functions/copyTexImage2D.html
+conformance/more/functions/copyTexSubImage2D.html
+conformance/more/functions/deleteBufferBadArgs.html
+conformance/more/functions/texImage2DBadArgs.html
+conformance/more/functions/uniformfBadArgs.html
+conformance/more/functions/uniformiBadArgs.html

--- a/content/canvas/test/webgl/failing_tests_windows.txt
+++ b/content/canvas/test/webgl/failing_tests_windows.txt
@@ -1,1 +1,18 @@
-
+conformance/buffer-offscreen-test.html
+conformance/drawingbuffer-static-canvas-test.html
+conformance/drawingbuffer-test.html
+conformance/framebuffer-object-attachment.html
+conformance/gl-getshadersource.html
+conformance/glsl-conformance.html
+conformance/glsl-long-variable-names.html
+conformance/invalid-passed-params.html
+conformance/object-deletion-behaviour.html
+conformance/premultiplyalpha-test.html
+conformance/read-pixels-test.html
+conformance/webgl-specific.html
+conformance/more/conformance/quickCheckAPI.html
+conformance/more/functions/copyTexImage2D.html
+conformance/more/functions/copyTexSubImage2D.html
+conformance/more/functions/deleteBufferBadArgs.html
+conformance/more/functions/texImage2DBadArgs.html
+conformance/more/functions/uniformfArrayLen1.html

--- a/content/canvas/test/webgl/test_webgl_conformance_test_suite.html
+++ b/content/canvas/test/webgl/test_webgl_conformance_test_suite.html
@@ -359,16 +359,32 @@ function start() {
     failingTestsFilename = 'failing_tests_mac.txt';
 
   var testsExpectedToFail = loadTextFileSynchronous(failingTestsFilename)
                             .replace(/\r/g, '') // convert to unix line breaks
                             .split('\n');
 
   var testsToIgnore = [];
 
+  if (kIsMac) {
+    // intermittent failure on Mac OS 10.6, "images are different". Some compositing issue??
+    testsToIgnore.push('conformance/shaders/glsl-features/../../glsl-features.html?feature=abs-frag&reffs=shaders/glsl-features/abs-ref.frag&testfs=shaders/glsl-features/abs.frag');
+    testsToIgnore.push('conformance/shaders/glsl-features/../../glsl-features.html?feature=abs-vert-vec2&refvs=shaders/glsl-features/abs-vec2-ref.vert&testvs=shaders/glsl-features/abs-vec2.vert');
+    testsToIgnore.push('conformance/shaders/glsl-features/../../glsl-features.html?feature=abs-vert-vec3&refvs=shaders/glsl-features/abs-vec3-ref.vert&testvs=shaders/glsl-features/abs-vec3.vert');
+    testsToIgnore.push('conformance/shaders/glsl-features/../../glsl-features.html?feature=abs-vert-vec4&refvs=shaders/glsl-features/abs-vec4-ref.vert&testvs=shaders/glsl-features/abs-vec4.vert');
+  }
+
+  if (kIsLinux) {
+    // on talos-r3-fed64-019 I got this error message:
+    // Test failed, "gl.getExtension("OES_texture_float").myProperty should be 2 (of type number).
+    // Was undefined (of type undefined)." (URL: conformance/oes-texture-float.html)
+    // on other linux test slaves it worked. Does this test slave have different driver or hardware or what?
+    testsToIgnore.push('conformance/oes-texture-float.html');
+  }
+
   var testsSuccessful = [];
 
   runTestSuite();
 }
 
 </script>
 </head>
 <body onload="start()">