On my Dell laptop for the last week or so something is blocking Firefox from opening certain pages, but not others. You tube and google are fine as are other pages, but ANY antivirus page or fire fox help and update are blocked ( I'm writing this on a PC ). Fox news sort-of loads but it's just text and links, Twitter X won't load and oddly enough IMDB is also affected. I have already run scans with Avast, Malwarebytes, Rkill, Hitmanpro and RogueKiller. Haven't run tronscript as I am sketchy about it messing up something. My other devices all share the same Firefox account and are synced but they don't exhibit this activity. I also checked FF extensions and start-up programs and didn't see anything I didn't recognize. What should I do next?