The Tor Browser / file revision

 /* Any copyright is dedicated to the Public Domain.

    http://creativecommons.org/publicdomain/zero/1.0/ */

 /**

  * Tests if the WebGL context is never instrumented anymore after the

  * finalize method is called.

  */

 function ifWebGLSupported() {

   let [target, debuggee, front] = yield initBackend(SIMPLE_CANVAS_URL);

   let linked = once(front, "program-linked");

   front.setup({ reload: true });

   yield linked;

   ok(true, "Canvas was correctly instrumented on the first navigation.");

   once(front, "program-linked").then(() => {

     ok(false, "A 'program-linked' notification shouldn't have been sent!");

   });

   yield front.finalize();

   yield reload(target);

   yield removeTab(target.tab);

   finish();

 }