Is your feature request related to a problem? Please describe.

Have seen more threads lately on how to identify if an extension is in use at a site. Site maintainers find difficulty in knowing whether a plugin code is still used in their articles. Could be a loadmodule or a form integration or a gallery, all initiated by a plugin tag.

Describe the solution you'd like

Would be nice to see the backend article search being extended to allow searching for plugin tags in a special 'source mode'. Direct search in intro and full text source, to know if a plugin tag is still in use. This to avoid broken content where you forgot to remove a no longer used included extension.

Additional context