Very good addon but there is one issue i keep facing which is watch history reset time to time. It is getting reset time to time and i dont know why. I started to look for replacement just because of this.

This extension is great because you never click on a video that you have already seen. One thing that is not true is that it only works with the new YouTube user interface. Since YouTube changed the user interface, I've been using the YouTube Redux extension to get the old user interface back. I just don't like the fact that the comments are now on the right and there are suggestions for other videos below the video. The Watchmaker extension works perfectly with the YouTube Redux extension and everything runs smoothly, and I haven't noticed any problems. The YouTube Redux extension forces the previous user interface.

Great concept, but ultimately too many false positives for watched videos, even after adjusting the settings a few times. An in-browser "mark un-played" button would be helpful, as it is removing play marks from a text-only list is more work than it's worth for me.

Edit to add: Actually an option to have the extension mark a video as played only when the progress bar hits a certain threshold (100%, 95%, etc) would be ideal

nice add-on! i must say this is another must-have youtube extension

Great stuff!

Could you add support for shorts as well?

Works fantastic

It marks clearly watched videos. It's easy to export and import watched videos from a browser to another.

I can't even remember what Youtube is like without this addon. Incredible work.

Very useful, nicely structured, would be 5 stars if
1) it didn't slow YT videos to an almost complete lag; (database 4495)
---Would marking the text (purple or red) instead of the image use less resources?
---I have many unloaded tabs of videos, is something collating all those unloaded tabs each time?
2) it said when each option marks a video- do any mark when they are queued? When do the YT options mark them? When does history matk them
3) once you have a collection in memory, which ones are needed to update it?

Very useful tool !
Thank you

Works great in standard desktop mode, does not work when viewing youtube from the mobile feed, on a computer and a regular browser....

Works even on different computers. You only have to log in to your gmail and you see all the marks videos you´ve watched on another computer

Handy extension that actually fills a real need rather than just adding fluff! Two nice additional features would be 1) The ability to mark a video "unwatched" and 2) The ability to set a threshold (in seconds, maybe?) after which the video is marked "watched". Right now, simply loading the video (but not even playing it) marks the thumbnail as watched. Great extension nonetheless.