I recently migrated from Firefox to the more cutting edge Firefox Nightly. As its name implies, Firefox Nightly is updated on a nightly basis. The reason for my switch initially was to get access to a 64-bit version of Firefox on my Windows 7 system. I fell in love with Nightly, so much so that I now use it on ALL of my computer systems. Unfortunately, there is no yum repository for Nightly yet (as far as I know), so I can't update Nightly automatically. My solution was to write my own Bash shell script to semi-automate the process. I just run the script once a day (late in the day so that I run it after the daily update). The script downloads the latest Nightly build for GNU/Linux, unpacks it, installs it, and then deletes all of the downloaded files.