This article teach you how to release the memory to the system when you minimized firefox.
Sometimes, user install a lot of themes, plug-ins, and extensions which will cause their firefox consume a lot of memory. It is highly recommend that user uninstall unnecessary themes and plug-ins in order to reduce the memory usage.
Normally firefox will take around 80MB of memory after you open a few tabs. But after you “realeased the memory”, it only take around 20-30MB.
1. Launch Mozilla Firefox
3. Right click at the content (anywhere) and choose New->Boolean.
4. In the textbox, type config.trim_on_minimize and press OK.
5. Set the value to true, and press OK.
6. Restart firefox to take effect.