have just been browsing through post and came across...
http://forums.mozillazine.org/viewtopic.php?t=32363
who mentions
Go to Start> Run > Type in > "c:\program files\mozillafirebird\mozillafirebird.exe" -p
THe -p switch brings up the profile manager.
only when i tried it it didnt work... location unavailable
my mozilla firebird 0.6.1 was downloaded.