Im sure with that amount of cash you can find some underground blackmarket to procure those items <| sep |> The details are still being considered , but essentially the idea will be to replace XUL bits with equivalent and possibly new web standards . XPCOMlike abilities and something like XUL overlays are still being considered as far as I can tell , but it may be possible to just use simple Javascript APIs or upcoming web specs like Web Components to do most things as easily as overlays it ' s hard to tell , and easy to be skeptical about that . There ' s at least already an early idea about how users may be able to add their own WebExtension APIs is with WebExtensions Experimentsexperiments . readthedocs . ioenlatest . Basically , a lot is still up in the air , which is why most people are extremely doubtful that this 2017 schedule will be feasible . But now that WebExtensions are reaching parity with Chrome ' s extensions , these details will be the next in line to work out . We ' ll need addon and theme devs to work with Mozilla to seek better and less flimsy ways to do what they want , instead of just seeking things similar to XULXPCOM . And that ' s probably going to be the biggest timesink of all , so I ' m right up there with people in their doubts on this proposed schedule .