Why does the UI freeze during what should be background tasks like checking e-mail on the server?
Often when I am in the middle of typing a reply, the cursor freezes, the application no longer accepts keystrokes, and the UI "locks up" -- as far as I can tell, this happens when Firefox decides it is time to check the server for new e-mail messages.
I would think that checking the server for new messages should be work performed in a background task, and not cause the UI to "Freeze"?
Are there any settings I can adjust to ameliorate this?
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What you describe sounds like the computers CPU is overworked.
Start Firefox in Safe Mode {web Link} by holding down the <Shift>
(Mac=Options) key, and then starting Firefox.
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-hangs-or-not-responding