Some websites are slower on 91
Certain websites are much slower on 91 (same on my laptop, I compared 90 vs 91), for example http://www.tailfeathersnetwork.com/community/ (also logging in and out) and https://www.unexplained-mysteries.com/forum/ . Why?
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Make sure you are not blocking content.
Diagnose Firefox issues using Troubleshoot(Safe) Mode {web link}
A small dialog should appear. Click Start In Troubleshoot(Safe) Mode (not Refresh). Is the problem still there?
https://support.mozilla.org/en-US/kb/enhanced-tracking-protection-firefox-desktop
Many site issues can be caused by corrupt cookies or cache.
Warning ! ! This will log you out of sites you're logged in to. You may also lose any settings for that website.
- How to clear the Firefox cache {web link}
https://support.mozilla.org/kb/Firefox+is+already+running+but+is+not+responding
https://support.mozilla.org/en-US/kb/firefox-slow-how-make-it-faster
https://support.mozilla.org/en-US/kb/firefox-uses-too-many-cpu-resources-how-fix
https://support.mozilla.org/en-US/kb/firefox-uses-too-much-memory-ram
https://support.mozilla.org/en-US/kb/firefox-hangs-or-not-responding
Tried all of that, nothing worked. I do not think this is a problem on my end, because it started happening on two devices as soon as I installed version 91 yesterday.
Who are you using for dns? How about clearing your dns cache.
I've tried ipconfig /flushdns, nothing.