List of ways that notification bar are used in Firefox 3.1 based on a search for callers to the appendNotification and showMessage methods in MXR.
Offline storage - quota warning
Offline storage - permission requested
Locked profile: "Browser Startup Error"
Rights notification: "Know your rights" - "Firefox is free and open source software from the non-profit Mozilla Foundation."
New feed reader
Register protocol handler (discovery + success)
Restart to install addons
Add-on compatibility checking is disabled. You may have incompatible add-ons.
Add-on update security checking is disabled. You may be compromised by updates.
All add-ons have been disabled by safe mode.
There are new updates available for your add-ons.
New add-on has been installed
No updates were found.
Software installation has been disabled by your system administrator.
Software installation is currently disabled. Click Enable and try again.
Offline mode - unable to update add-ons. Click Go Online and try again.
Offline mode - unable to search for add-ons. Click Go Online and try again.