FireFix automatically updates Firefox to the latest nightly version. No user intervention is required, everything is fully automated.

1. Downloads Firefox nightly build from web server
   

2. Mounts the disk image
   

3. Creates a backup of the previous version on disk
   

4. Copies the new nightly build to its default location
   

5. Option to launch the new version of Firefox
   

6. Option to undo latest install and revert to last version
   

7. Option to show the change log for past week
   

8. Preserves the user's search plugin settings
   

9. Makes backups of bookmarks and cookie files
   

10. Optionally installs Philippe Wittenbergh's OS X widgets