Reseting the plug-in will erase all saved data: offline pages and databases, including topics and style changes. To make this go to the firefox browser, and under the menu 'tools' choose 'extensions'. This will open the extensions window as in fig.1.

Select the 'sketcher' extension object and click the 'options' button. A Sketcher window (fig.2) will open.

Click the to reset all 'sketcher' info.

To uninstall the plug-in from firefox, just click uninstall from the extensions window (fig.1).