Bring. Back. XUL.

Or at least something as functional.

And HTML5 with modern JS were a mistake. Maybe it all can be made some kind of embeddable content processed in its own sandbox in an optional plugin. Just like with Flash. So something like NPAPI, but for modern age with its security nuances.

I know nobody is going to do that, just if Firefox were still faithful to its initial goal, they would try to introduce their own evolutionary paths and not just chase Chrome (which is a lost cause anyway). Even if Chrome is being treated as standard.

I won't object to this comment being treated as idiotic, FF is a mainstream browser now, them just dropping half the modern common web standards in favor of some own idea of things would be a weird kind of suicide.