Maybe its time to reconsider Chrome? It does what Firefox does, but without the added band width of grinning show offs.
Did you miss the whole plugin debacle going on with Chrome?
You know, the "you need to rewrite your plugin using one of our APIs" thing?
Don't even get me started about NaCl and the brillant idea to allow any C/C++ system calls except a few that are blacklisted. Because what could possibly go wrong with that idea?