Just recently Firefox has been giving me all sorts of issues while at home. I did just get a new router and have tried all the trouble shooting that goes along with that but that didn't solve the Firefox issue. Anytime I get on a site like Youtube for instance, none of the thumbnails load and I just get a loading wheel inside the video screen until I receive an error message. I have used my phone as a mobile hotspot and as soon as i connect to the mobile network, these Firefox problems disappear. Is this a router issue or possibly a plugin issue?

Thanks