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I love firefox too. But for me it always starts slowing down half way through the day (about the same time as I do). Maybe its firebug? This has happened on windows and mac. Restarting it makes it work better, like myself after lunch.

Its still my favorite browser though.

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Go to about:memory then click the "Minimize memory usage" button.

P.S. If anyone knows how to add that button to the FF toolbar, I would consider you a minor deity for at least a whole day.

Interesting. What does pressing that button actually do?

If you hover that button with your mouse pointer you can read the following explanation:

Send three "heap-minimize" notifications in a row. Each notification triggers a global garbage collection followed by a cycle collection, and causes the process to reduce memory usage in other ways, e.g. by flushing various caches.

Firebug can definitely slow down the browser. You can try browsing for a while without it, perhaps using a separate profile.

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