MarkNest stores saved webpage titles, URLs, personal notes, tags, favorite status, and user preferences locally in Firefox.

This information is only used to provide the add on features requested by the user. MarkNest does not send data to external servers and does not use analytics, advertising, tracking, or third party services.

Users choose which webpages to save and can edit or delete their saved information at any time. Export files are created locally only when the user selects the export option.

Uninstalling the add on removes its locally stored data from Firefox.