The Tor Browser: browser/base/content/newtab/preloaderContent.js@b8a032363ba2

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

     1 /* This Source Code Form is subject to the terms of the Mozilla Public

     2  * License, v. 2.0. If a copy of the MPL was not distributed with this

     3  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     5 (function () { // bug 673569 workaround :(

     7 const ALLOW_BG_CAPTURES_MSG = "BrowserNewTabPreloader:allowBackgroundCaptures";

     9 addMessageListener(ALLOW_BG_CAPTURES_MSG, function onMsg(msg) {

    10   removeMessageListener(ALLOW_BG_CAPTURES_MSG, onMsg);

    12   if (content.document.readyState == "complete") {

    13     setAllowBackgroundCaptures();

    14     return;

    15   }

    17   // This is the case when preloading is disabled.

    18   addEventListener("load", function onLoad(event) {

    19     if (event.target == content.document) {

    20       removeEventListener("load", onLoad, true);

    21       setAllowBackgroundCaptures();

    22     }

    23   }, true);

    24 });

    26 function setAllowBackgroundCaptures() {

    27   content.document.documentElement.setAttribute("allow-background-captures",

    28                                                 "true");

    29 }

    31 })();

The Tor Browser / file revision