Curb Firefox's RAM Appetite
Firefox was once famous for how light it was on system resources. With each new update, however, it seems be become a bigger and bigger memory hog. Rein Firefox in a little by limiting the amount of memory it uses. Type about:config in the address bar and locate "browser.cache.disk.capacity." Normally, it's set to "50000," but you can lower that number if you find Firefox is using too much system memory.