Testing difficulty: easy Install some add-on into your site, preferably using the new Install add-on admin tool. Visit Site administration ► Plugins ► Plugins overview TEST: Make sure there is the link 'Uninstall' displayed for the add-on and that it works (i.e. the add-on can be uninstalled). Notes: The 'Uninstall' link should never appear for plugins that are required by some other plugins. Plugins that do not have their own uninstallation script should be uninstalled by admin/plugins.php. This new common tool is also able to delete the plugin folder from the disk if the web server process has required write access. This applies only to plugins that do not have their own uninstall script (there is a separare issue for that). So for example, if you install a theme via the web interface, you should be also able to remove it completely via the web interface too.