Wow, #Element (the flagship #Matrix client) dropped support for #Firefox ESR in release 1.11.70. Or rather, they never supported it in the first place, only supporting "last two versions". The change causes a corrupted session for ESR users, and can't be reverted to fix it.

(Note that all Debian Stable users, by default, run Firefox ESR. This is kind of a big deal. ESR is always up to date on security, and gets new features once per year.)

They're managing the issue somewhat badly: github.com/element-hq/element-…

The best we've gotten so far, from a dev caught in the middle:

« Element devs follow the policy set out by people that manage them, they get an input but they do not control the policy. »

Nothing from their employer, whoever that is.

Make sure Element Web works with Firefox ESR · Issue #27684 · element-hq/element-web

Your use case It seems (given the discussion in #27682, unless the person in charge of support there) that Firefox ESR isn't supported. Given it has a large user base (enterprise, Debian stable and...

^GitHub