1)exit your firefox 2)open or create a file named user.js,and include the following lines
user_pref(“config.trim_on_minimize”,true); user_pref(“browser.sessionhistroy.max_total_viewers”,8); user_pref(“browser.cache.memory.capacity”,16530); user_pref(“browser.cache.memory.enable”,true); user_pref(“browser.urlbar.clickSelectAll”,true); user_pref(“browser.urlbar.hideGoButton”,true); user_pref(“dom.pop_maximum”,5); user_pref(“extensions.dss.enabled”,true); user_pref(“network.dnsCacheEntries”,40); user_pref(“network.dnsCacheExpiration”,1200); user_pref(“network.dns.disableIPv6”,true); save and exit. 3) put the file to the path including your firefox working path.i.e ~/.mozilla/firefox/q04xpu0l.default. 4)run your firefox again. Powered by ScribeFire.