How to uninstall XUL applications by hand?
 
Some apps includes a self uninstaller, but others don't have. And, when you cannot start Mozilla owing to a fatal error of the app, you have to uninstall it by hand.
 
Uninstallation process is following:
 
   1. Exit NS/Moz. If you use the feature "Quick Launch", then exit the icon of task tray.
   2. Remove following files and directories fron /chrome/ directory of the place NS/Moz installed: <appname>.jar, overlayinfo[dir], and chrome.rdf.
   3. If you installed the package as the administrator, open installed-chrome.txt by Notepad and so on, and remove following lines:
 
content,install,url,jar:resource:/chrome/<appname>.jar!/content/<appname>/
(locale,install,url,jar:resource:/chrome/<appname>.jar!/locale/en-US/<appname>/)
(locale,install,url,jar:resource:/chrome/<appname>.jar!/locale/ja-JP/<appname>/)
(skin,install,url,resource:/chrome/<appname>.jar!/skin/classic/