One menu item.
A real account update.
Open YouTube in the profile where the extension is installed. Keep watch history enabled and check that you are using the right YouTube account.
- Find a video thumbnail on YouTube.
- Open its three-dot More menu.
- Choose Mark as watched.
- Wait for the confirmation message before leaving the page.
Read the result
Confirmed
YouTube returned the video in your history with complete progress. The thumbnail's bar is updated. A fresh YouTube page should show the native full bar too.
Unconfirmed
The reports were sent, but YouTube did not return the required history and progress evidence. The extension does not display a successful completion.
Blocked or failed
The message explains the problem, such as a signed-out account, paused history, unavailable video, or network failure.
Where the menu appears
The extension handles modern and classic thumbnail renderers used on the homepage, channel pages, search, playlists, and suggested videos. YouTube changes its layouts and runs experiments, so a particular layout may need an extension update.
What stays unchanged
The extension does not like videos, subscribe to channels, change history settings, or mark other videos automatically. It does not open a player or create a local watch-history database.
Recommendation behavior
The extension can verify stored history and progress. It cannot inspect YouTube's recommendation ranking or guarantee which videos will appear in your feed.