Hi!
Vielleicht hilft das hier noch etwas weiter:
[google]"errorlevel batch"[/google]
http://www.robvanderwoude.com/errorlevel.html
Ciao Frederic
P.S.:
[equote="Google 'safe mode' firefox"]
Safe Mode is a Firefox startup mode where all the extensions you have installed are disabled. This is useful for debugging and seeing which extension might be causing a problem, especially since extensions are known to act up.
[/equote]