Have you installed add-ons other than ublock origin?
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Might be a bug, so we can troubleshoot to try to figure it out.
If you visit about:processes, is there any website or extension taking up a lot of system resources?
In addition to that, you can try launching firefox in safe/troubleshooting mode. 3 bars in the top right > Help > Troubleshooting mode
This restarts firefox with all addons, extensions, and themes disabled.
For further troubleshooting, also try:
Go to about:profiles, and create and launch a new one. This is a more complete reset, since it also resets all settings, about:config options, and similar.
After creating a new profile, you can play around with rebuilding your current firefox config, adding extensions and changing settings.
Firefox is good for me on a lot of sites, but it doesn’t seem to like Lemmy as much as I do. So I use Safari for that (I’m on a Mac). And then I just keep using Safari because I really don’t hate it.
Maybe something you have changed a long time ago in about:config that does not work out with a recent update ? I don't know if it's possible
Or add-ons as previously mentioned
Or DNS over HTTPS configured in Firefox that does not work anymore for any reason
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