That doesn't sound typical. Have you tried doing a Firefox reset? I've seen it make a large improvement to performance, especially with older Firefox profiles:

That doesn't sound typical. Have you tried doing a Firefox reset? I've seen it make a large improvement to performance, especially with older Firefox profiles: https://support.mozilla.org/en-US/kb/reset-firefox-easily-fix-most-problems https://support.mozilla.org/en-US/kb/reset-firefox-easily-fi... (In short: Go to "about:support" and click reset. It will prompt you before doing anything, and will rebuild your profile while preserving bookmarks/history/saved-forms/etc)