i'm impatient recently and did a mistake when installing firefox theme, i clicked the theme installing link quite a few time, now in my theme windows i saw a sucessfully installed theme and the same theme which stuck on "firefox is checking for compability" which is not usable and uninstallable. How do i remove the unusable theme? By the way what is the path that firefox use to store all the theme?

any help is much appreciated.

goto your profile folder and check the directory "extensions" there

if you don't know where your profile is
start firefox.exe with -p parameter

in the extension folder you will find numerous ID folders ... check the content of those and find out which one is the skin then delete it

thanks Mertsch, got it works now... 8)