Go to Start menu, choose CometMarks from All programs, and click “Uninstall CometMarks”.
Follow the uninstallation window (below) to uninstall CometMarks.
To remove CometMarks from Firefox, firstly go to the Tools menu on Firefox and click “Add-Ons”. Click “Extensions” in the dialog box and you will see all the add-ons installed in your browser. Find “CometMarks Bookmark Synchronizer” and click “uninstall”.
Restart your browser and CometMarks will be successfully removed. Or click “Cancel” to cancel the uninstallation if you don't wish to continue.