Add an indicator for watched videos on YouTube. Use GM menus to display history statistics, backup history, and restore/merge history.
< Feedback on Mark Watched YouTube Videos
That .ytd-item-section-renderer was incorect. In YouTube, all "section" related elements is a container of one or more "items" (whatever type that is).
As it was discussed in below thread, it was due to YouTube A-B or A-B-C testings; which is still being in the work.
https://greasyfork.org/en/scripts/30261-mark-watched-youtube-videos/discussions/303991
65 and 66 version breaks highlighting on "History" page
Can be: reverted to either 64 version or added part of code to line 113:
.ytd-item-section-renderer,Update: Hm. Not fixing fully. Highlighting but can't highlight new videos
Developer, can you verify?