i have downloaded version 4.0 but my current 3.16 version is still being used .how do i switch to the new version on my mac10.6
i have a mac 10.6 and use firefox 3.16. i have just downloaded an updated version 4.0 which is in the down load folder but the version i am still using is the previous one . how do i use the latest version. i am a new user of apple mac.