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Firefox is slow or stops ...
Firefox is slow or stops working
Firefox takes a long time to start up
How to fix common problems with Firefox OS Developer Preview
Firefox hangs or is not responding - How to fix
Firefox uses too much memory (RAM) - How to fix
Firefox uses too many CPU resources - How to fix
Firefox is slow - How to make it faster
Firefox does not work - Common fixes to get you back up and running
Memory constraints, Firefox performance and Firewalls