Does Firefox use up too much of your RAM? Teach it to behave by limiting the amount of RAM it uses. To do it:

1. Type about:config into your address bar and hit Enter.


2. In the Filter text box, at the top of the page, type browser.cache.


3. Double-click the "browser.cache.memory.capacity" entry.


4. The default is 50000. If you don't have a lot of memory on your system, for example, between 512MB and 1GB, change the number to 15000 and click OK.