Problematic Firefox

Mozilla, you are slipping... I mean Firefox 3.5 has been nothing more that a complete disaster.  Slow loading of pages, browser hangs up, Javascripts not working and the list goes on... Websites that I can get to open normally with other browsers seem to just not work with Firefox 3.5.  Even after upgrading from 3.5 to 3.5.2, things seem to have become even worse.  I have tried everything I could think of.  Started Firefox in Safe Mode, disabled extensions and nothing works properly.  I have reverted back to 3.0.13 and at least things are working again.

Mozilla, step your game up..  This is just not good enough!