For the past week, I've been overrun with pop ups and tabs opening on Firefox. Every time I click on anything-bam, bam, bam-6-8-10 tabs open all at once, along with dozens of pop ups-enough to completely cover the screen. All this happens in just a couple seconds, and Firefox has become useless to me. I close them out and click on anything-it all happens again. Usually when I try to download pop-up blockers, Firefox crashes; like it's fighting me. When I finally do get a blocker downloaded and installed, it does nothing to help (I've tried several). My anti-virus is active (Bitdefender). In "tools"-"Options", the pop-up blocker is checked. I have worked on this for hours the past few days.

Please don't just tell me to do "this"-I need you to tell me 'how' to do what you need me to do. Thanks.