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

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

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 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!!

Great app. Easy and smooth to use.

Suggestion : Would love an option to change the date stamp format to dd / mm / yyyy. The default one is kind of backwards...

:)

Very useful tool !
Thank you

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