MassPatrol is a script that allows quick patrolling of lots of changes. It makes it possible to patrol all the edits on a specific page up to a specific diff.
The script can only be used by high-level local staff (admins, content-moderators).
The script adds its button when comparing diffs for a page (next to where the patrol button normally appears). If this current diff doesn't need to be patrolled, or if this current diff is the only diff to be patrolled, then the button won't show.
A click of the button allows the script to patrol all past revisions for the page up to the currently viewed revision.
Note that script does not patrol moved pages, because this is technically impossible to get information about them in the RecentChanges feed.