And that is the price they pay for trying to be Chrome clone UI wise and not listening to to the "power users". I hate to use the words "power user" but it is the small group of very active and enthusiastic users that you need to give the appears to every one else that they are missing out on something cool.

I still use Firefox because it works reasonably for my usage but I stopped promoting it to other people around me. For the average user Chrome is good, very good even. And Firefox lost its uniqueness and UI differences that made it stand out. And if nobody talks anymore about your product then you are done.

true. their api is now a dumbed down version of chrome.

I still remember the days of vimperator and treetabs in xul.

firefox did this to themselves. they dont deserve support.

Vimperator replacements exist: https://github.com/tridactyl/tridactyl

Additionally, XUL was a steaming pile of shit, and there was no saving it. Multithreading was only possible by ripping out XUL.