Amusingly the latest build of FF seems to address the unresponsive flash module issue. Not well but it is an improvement.
Now if they could just lose the in-built pdf handler which is slower than a slow thing on a slow day and usually reports "this document may not be displayed correctly, would you like to open it in another application" that'd be nice. As would not trying to handle every goddamn extension internally.
Rant over. As always about:config will allow you to turn off the utter lunacy FF devs seem to think is necessary - like why do you think your browser should intercept and route DNS requests via your DNS even when you uncheck the boxes in security tab? Security my backside, tracking and selling user data is more likely IMHO.
About at the end of my tether with FF, only thing keeping me there now is noscript.