It stops working for couple of weeks now. No update, last is from 7 months ago.

Unfortunately, the viewing date for many videos is set to the date of installation of the extension. Secondly, if you enter a word in the YouTube history search, the viewing dates of all the videos that appear in the search will be updated to the current date, even if they were viewed 10 years ago.

Addon is not working at all for me presently, and when enabled it makes Firefox use 100% CPU on all cores of my CPU. Disabling it drops the CPU load down to around 25%. I had to disable it for my computer to be usable.

Love the extension - extremely useful, but as of last Windows update, no longer working?

Honestly it more often doesn't work than it does

Exactly what I needed. Really clearly labels watched vids. Import from ff history and youtube then good to go. So good, i'm going to see if I can throw a donation at the author

As of 2/4/25 it's currently not marking videos on the main youtube page as watched even if I've watched them. It's working on the subscription page and in search.

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

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.

One of my favorite add-ons on YouTube. I watch 100s of videos weekly and this helps me out a lot in tracking what I've seen and what I haven't. really fantastic add-on!!

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?