Just recently Firefox keeps crashing and I'm also getting a lot of pop ups entitled ADS SERVED BY ADS SITE - how can I get rid of these, I never used to get them before and are they something to do with Firefox crashing all the time?

Please read THIS and after completing the steps outlined post a HijackThis log over in that section along with a brief description of your problem.

Do not post HijackThis logs in this section please.

ok will do, thanks Jephree

No problem. Neal or VopThis should reply within 24 hours.

They should be able to clean you up.