Hi, in browser/base/content/sanitize.js and browser/components/privatebrowsing/src/nsPrivateBrowsingService.js, we have let ph = Cc["@mozilla.org/plugin/host;1"].getService(Ci.nsIPluginHost); which is just after QueryInterfaced to nsIPluginHost again.
Created attachment 554845 [details] [diff] [review] patch proposal patch proposal. I've tested it on try server: http://tbpl.allizom.org/?tree=Try&usebuildbot=1&rev=2a0db7f49e9e
Comment on attachment 554845 [details] [diff] [review] patch proposal I think this is ehsan's code.
Pushed to inbound.