The FlashGot extension for Mozilla boil up my whole night! It took me the whole night to get it uninstalled! As I can't  uninstall the fucking FlashGot, I had to install an new Mozilla 1.7.5 and copied my old preferrences.

In all I concluded that FlashGot is an annoying thing, don't install it!

And I got an experience: Do not install anything that do not support uninstallation!