Have you actually tried Firefox? They've had a pretty big update recently, which also broke many extensions and ways of making advanced extensions, so some people do take that as reason to say that it's now "long way from its former glory", but if you've been a Chrome user up until now, it'd strike me as odd for you to think that, since it's still much more extensible than Chrome.

Well, unless you haven't seen the new update yet and are talking of the performance problems that it had prior to this update. In that case, you should try the new version.