Honestly there really isn't any way to stop ads on Firefox, I would suggest Google Chrome as the have a pop-up blocker that does work and is much (in my opinion) better than Firefox. Hope this helps.
I have just started using FireFox , and these advertisements are killing me! even those Add-ons dont help much. I even tried but its of no use! Can anyone tell me how to surf smoothly using firefox without any ads?
Use Google Chrome it is the best thing ever it is what I am using right now. Has no ads and works smoothly. Hope I helped :D