Watchmarker for Youtube

sniklaus.com

Featured

4.4 (

146 ratings

)

Extension Tools 8,000 users

27 support issues

For additional help, check out the developer's support site.

ccf fpc

Mar 2, 2026

Feature Request

This is a great feature. I love it!
Feature Request
- Adjustable fade-out level
The original thumbnail is hard to see by default...
- Easily toggle between watched and unwatched
Switches, shortcut keys, etc.

Ireallyreally Hategoogle

Sep 1, 2025

Doesn't really work anymore

The extension keeps adding newly watched videos to the database, but the visualization doesn't show on YouTube, so i have no way of knowing which videos i have watched, aside from the defective YouTube progress bar.

Naomi Erin Collins

Aug 20, 2025

There seems to be a remake for V3, uploaded today

Not sure if this is on the level, but it seems to be working for me at least. Would love some feedback by the original creator of this addon to check for its legitimacy?

https://chromewebstore.google.com/detail/youtube-watchmarker-v3-re/phoakahhndaanafnmallehjodhldlkgp

Brian Jensen

Jul 22, 2025

updated for manifest 3

Some guy did the work to update this. You have to sideload it for now, but it works.

https://github.com/widike/youtube-watchmarker

Shane Chambers

Mar 30, 2025

Manually side load this extension

For those technically inclined, this is the steps I just had to follow to reload in Chrome after it accidentally got removed.

1) Clone the git repo from sniklaus
2) Install it in FireFox
3) Go into your local FireFox directory, and find the file "yourect@coderect.com.xpi". I don't know if file names differ. If you just installed it, look for the most recent file in the extensions directory.
4) Copy that file somewhere else, and unzip it. (XPI files are just zip files)
5) Copy the files in the "content" directory in the zip file, over to the content directory of where ever you did the git clone. I only replaced the missing files, I did not overwrite what was already present from the git clone.
6) Go into Chrome Extensions, and make sure "Developer Mode" is enabled.
7) Click on "Load Unpacked" and navigate to where ever you did the git clone.
8) Click OK.

It works for me now, although it's saying that there's an error in the manifest file.

Eolhin Forest

Mar 3, 2025

Chrome has disabled this

Chrome has disabled this, and any other useful extension I can find that does the same thing. Any chance of an update so that it works again? Please?

Robert Stouder

Dec 31, 2024

Any plans to update app for MV3?

Love your app, been using it for years. Hope it will be updated for MV3.

MasterMo aka SonicShenmue

Sep 19, 2024

Youtube shorts not greyed out anymore

HI, I love the extension for years now. Youtube shorts not greyed out anymore unfortunately. I would love if that could be implemented again.

Thank you in advance :)

Maksim Pelevin

Feb 14, 2024

like-marker?

Can this extension mark videos that I have liked (or disliked)?

Rocco V

Nov 14, 2023

Videos marked watched when not watched

Is there some problem now with this extension? Used to work properly all the time. Now, on numerous occasions, I see videos marked watched that I'm pretty sure I didn't watch. Am I the only one? Are there any conflicts that could cause problems with this extension?