- Go to the Tools pull-down menu and select Addons
- Click Extensions and select the item you want to remove
- Click the button.
If you installed LibX and like it but don't want to clutter your browser window with the search box, you can just hide the LibX toolbar by going to the View pull-down menu, go to toolbars and select LibX UCSC to remove the check next to it and hide it from view. Follow the steps again to make it reappear when you want to use it.