I'm in the the same situation that WarwolfPrime is.
I'm running XP Pro SP3 on an old quad core (Kensington) with 2GB ram and still using Fx 28.0 as my browser.
I never updated to the later versions of Firefox because I really like using the Classic Compact theme and it always seemed to work just fine, until last week.
I would like to stick with Firefox, so I can keep all my bookmarks, history, settings, session/tabs etc. However, since XP is no longer being supported, maybe it's a better idea to jump to one of the forks. It's difficult to find information and reviews about the pros and cons of doing this, so I thought I would ask for some opinions here.
Should I move to one of the forks? If so, which one? New Moon, Basilisk or MyPal? Are they all compatible with Fx 28.0 themes/add-ons?
Any advice or opinions would be appreciated.