1480041 - Use CPOW detection to take getTabForBrowser shortcut in _getTabForContentWindow

Status: NEW

(Firefox :: Tabbed Browser, enhancement, P3)

Description

[:Gijs (he/him)]

https://searchfox.org/mozilla-central/source/browser/base/content/tabbrowser.js#657-666

Does:

    // When not using remote browsers, we can take a fast path by getting
    // directly from the content window to the browser without looping
    // over all browsers.
    if (!gMultiProcessBrowser) {
      let browser = aWindow.QueryInterface(Ci.nsIInterfaceRequestor)
                           .getInterface(Ci.nsIWebNavigation)
                           .QueryInterface(Ci.nsIDocShell)
                           .chromeEventHandler;
      return this.getTabForBrowser(browser);
    }


AIUI we could just use Cu.isCrossProcessWrapper(), and then this would also work for e.g. about:preferences or about:addons tabs in e10s windows.