I've recently had issues with Firefox when it stops loading random websites completely. In the network log you can see multiple errors, as described in this bug report: https://bugzilla.mozilla.org/show_bug.cgi?id=1673534#c12
I don't have that many add-ons filtering/modifying web content, so I've tried disabling some of them to see which one could lead to this error. It has turned out that the Clean Links add-on is the culprit and disabling it restores Firefox operations.
It looks like you've stopped actively developing the add-on but when/if you get back to it, it would be nice if you could fix the error.
I've recently had issues with Firefox when it stops loading random websites completely. In the network log you can see multiple errors, as described in this bug report: https://bugzilla.mozilla.org/show_bug.cgi?id=1673534#c12
I don't have that many add-ons filtering/modifying web content, so I've tried disabling some of them to see which one could lead to this error. It has turned out that the Clean Links add-on is the culprit and disabling it restores Firefox operations.
It looks like you've stopped actively developing the add-on but when/if you get back to it, it would be nice if you could fix the error.