Pages don't load or load slowly in Firefox 20 and 21
Firefox isn't loading websites while other browsers are working perfectly. It often shows "Server not found" error and doesn't load sites 9 out of 10 times. It loads sometimes but very slowly and many elements are not displayed properly.
Things I tried to fix this:
1. Disabled DNS Prefetching
2. Disabled IPv6
3. Cleared Recent History (Everything)
4. Reset Firefox
5. Created a new profile