Be careful with old versions!
These versions are displayed for reference and testing purposes. You should always use the latest version of an add-on.
This is only for alpha and beta builds, 3.1 to 3.5. If you have Firefox 3.0, do not install this theme.
If your Firefox will not start normally, start it in Safe Mode, and uninstall SphereGnome 2.0.5.
In Windows: Start Menu > Run > firefox -safe-mode
On Mac OS X, go to Utilities (in the Applications folder) and open Terminal, then run: