Diễn đàn hỗ trợ Firefox

Until today it worked fine. But now whenever I try to login to Xfinity I get You don't have permission to access "http://login.xfinity.com/login" on this server. It works fine on Chrome and Edge. I have disabled my add-ons. I have cleared cache, cookies, etc. I have rebooted. I have turned off firewall. I have checked my DNS. I have changed the DNS protection to OFF in Firefox. I have checked my proxy setting (I have no proxy). I have reinstalled Firefox. Etc. Etc. Nothing works. The fact that it works on Chrome and Edge, that it has worked everyday until today gets me confused. I also tried using my mobile phone as a hot spot to make sure it wasn't related to my Internet connection or IP address. Anyone have any ideas?

FireFox 129.0.2 (64-bit) - This issue persists across updates.

If a YTTV tab is left inactive for a few minutes, the keyboard shortcuts (ex: 'm' to mute) stop working until the page is interacted with again using the mouse (clicking on mute/volume, stop/start the stream etc.) The stream plays normally otherwise.

I'm not sure if this is related to YTTV, Firefox, extensions or Windows (Win 10 Pro)

Extensions: UBlock Origin, Privacy Badger, MalwareBytes Browser Guard, Old Reddit redirect and Reddit Enhancement Suite

15-30 tabs are normally open. Firefox is currently using 2.5Gb memory (32Gb installed).

Privacy Settings are set to custom (image attached).

I'd like to be able to see the help page on audible in desktop browser I can still open the help page in chrome but not Firefox and it is annoying having to switch browsers.