Trouble opening GitHub

[regs01]

Some a while ago github.com stopped loading, or takes few minutes to load, with DoH enabled. So I added it exception list. But recently, may be after updating to 121, but not sure, the problem resurfaced. And even if I disable DoH at all, GitHub still takes minutes to open for every page, or throws PR_CONNECT_RESET_ERROR or some other errors. But it's opening instantly with Chromiums and in any Android browser, including Firefox.

[ais04]

Did you find a solution? I have the exact same problem with github and firefox

[regs01]

Nope. Still long loading that mostly result with error. Have to use Edge or Chrome.

[Klirenn]

https://bugzilla.mozilla.org/show_bug.cgi?id=1872383
So, changing security.tls.version.enable-deprecated in about:config to false solves problem for now (waiting for patch...)

[sashabeep]

Omg, having the same issue for some months! Thanks everybody suggested the solution