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installed debian sid on userland app. installed firefox. when i launch firefox, it just shows "gah: your tab just crashed". entering duckduckgo.com and press enter, it shows same error message. disabling hardware acceleration has no effect. is there any way to make it usable on my device?

Hi!, recently i have been having this browsing problem whenever I open the news website at https://www.cgtn.com/channel/documentary. The site wont load and error is shown- "cannot load M3U8:levelLoadTimeOut". Have tried numerous times but failed to load. However other web sites have no problem and prior to this I am able to surf at all times. What must I do to get back the browsing? Any help is appreciated. Thanks

I use Firefox on Linux Debian 11 (Bullseye). After a recent automatic update to Firefox 91.10.0esr, some websites will not load (just sit with a blank page, showing flicking loading symbol). Examples are ocado.com and abelandcole.co.uk. I have tried all the usual things to fix, including, switching off VPN, clearing cookies and caches, running in safe mode, all with no success. Both sites run fine in Vivaldi and Brave. I have eventually got the pages to load by disabling IPv6 in Firefox. Clearly there is a problem with 91.10.0esr. I'm not sure whether the workaround of disabling IPv6 might cause other problems or weaken security or privacy?