My MBP is my secondary/mobile machine and recently been using it to stream twitch and youtube while I do work on my iMac. Last week, when apple blocked flash, I din't want to update it as I had a few things I didn't want to lose my place on when restarting so i downloaded and installed firefox from the mozilla website. it worked perfectly, till today. Whenever I open it it directs to spam websites and even british airways for some odd reason and starts inputting random stuff. Does anyone know what this is or where it has come from? I've run clamxav to see if theres something there although I'm careful. it came back with nothing. Should I nuke the drive and start again? Thanks.