Another thing - Plugins

"Someone needs to let them know that they have a huge base of very
useful, non-trivial plug-ins that people actually use, and they tend
to break at least some of them with every update. We're still stuck on
3.6 waiting for the plug-ins to catch up because frankly they're more
important to us than FF itself. And now the new hotness is your addons
will just start being continuously breakable at any time?"

This guy has a good point :)

noscript ftw