Firefox EXTREMELY slow
One of the most pronounced issues in Firefox is that it takes five minutes to write a sentence of an email in an AOL. It freezes intermittently. I open Edge - and it's lightning fast.
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Start Firefox in Safe Mode {web link}
A small dialog should appear. Click Start In Safe Mode (not Refresh). Is the problem still there?
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
https://support.mozilla.org/en-US/kb/firefox-takes-long-time-start-up
Boot the computer in Windows Safe mode with network support to see if that has effect in case security software is causing problems.