Can't login using Firefox

I can't log in on any of ETC pages (forum, learning, etc) since some days ago using firefox browser (version 91.0.2).
I am using Safari andit works fine.
Any idea why this is happening?
MacBook Pro 2,5 GHz Quad-Core Intel Core i7

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  • Same for me for at least the last couple weeks. Firefox is up to date (92.0.1).I've tried multiple computers, mac computers, windows computers, turning off all ad blockers, tracking settings, etc. Chrome browser works fine.

  • Can you please check the following setting in Settings>General>Network Settings (all the way at the bottom):

    1. Is Enable DNS over HTTPS enabled (it turned on by default a few weeks ago) and if so, which provider is selected?
    2. If you feel comfortable disabling it temporarily, does that improve your connection ability?
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  • Can you please check the following setting in Settings>General>Network Settings (all the way at the bottom):

    1. Is Enable DNS over HTTPS enabled (it turned on by default a few weeks ago) and if so, which provider is selected?
    2. If you feel comfortable disabling it temporarily, does that improve your connection ability?
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