Upgraded Firefox but still tells to Upgrade -- Problem Solved

Yess! I finally found a way to get rid of those need to upgrade warnings! =)

Reset general user-agent -In Firefox, type about:config in the URL bar and press the Enter key. -If you see the warning, accept it (promise to be careful). -Filter = general.useragent.extra.firefox -Right-click that preference and select Reset -Then restart Firefox (File > Restart Firefox)

source: http://support.mozilla.com/en-US/questions/709793