--- a/dom/canvas/test/webgl-mochitest/webgl-util.js
+++ b/dom/canvas/test/webgl-mochitest/webgl-util.js
@@ -81,18 +81,16 @@ WebGLUtil = (function() {
 
       callback(gl);
       onFinished();
     };
 
     try {
       var prefArrArr = [
         ['webgl.force-enabled', true],
-        ['webgl.disable-angle', true],
-        ['webgl.bypass-shader-validation', true],
         ['webgl.enable-webgl2', true],
       ];
       var prefEnv = {'set': prefArrArr};
       SpecialPowers.pushPrefEnv(prefEnv, run);
     } catch (e) {
       warning('No SpecialPowers, but trying WebGL2 anyway...');
       run();
     }