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Does Firefox crash, it is slow, is your whole machine slow when you have many firefox tabs open?

It is possible you need to change the amount of memory Firefox is using, this is a common problem.

1. In the address bar, type about:config
   
2. Scrolldown to browser.cache.disk.capacity
3. Click on the number under the value column, and change it to 5000. At the time of writing, the default value was set at 50000.
4. Restart Mozilla Firefox