Great AddOn but it stopped working today.
Here is what happened, maybe someone can help me: today I ran CCleaner and then no more videos were marked.
I tried to reinstall the Addon, I tried to reboot the PC but both didnt work. I then tried to use the History Synchronize button and it says "synchronizing with history" but the progress stays at 0 and the "close"button is greyed out and I cant click it. I am desperate and I dont know what to do anymore :/

edit: ty for the fast response. Problem is fixed!

Great and a"must have" addon for Youtube users.

Feature request:
Add a feature that it removes watched from the https://www.youtube.com/feed/subscriptions when the video is marked as a watched. Give users a options when it removes them (when the video is full watched, 50% watched and so on).

Simple and works like a charm.

Essential for anybody who is really into YouTube.

TOP!! Works fine!

Thank you for making this addon for firefox. its working so far, this is the firefox version that im using (57.0 - 64bit)

worked very well until i updated to ff 57. totally loved it when it worked.
since updating to 57 my history and database are empty. and sadly no more "watched" videos.
when click on "synchronize" in the history-options a unclickable message saying "synchronizing with history" appears but nothing else happens until i reload or close the tab.
the search wheel at the buttom right is constantly turning but not finding anything.
already tried reinstalling the addon, overinstalling the browser and restarting the mac (os 10.12.6). it's just not working anymore.
on my older mac with el capitan this great addon strangely still works under ff 57.
any ideas?

G

.Works perfectly in Firefox 61 Beta....

It does exactly what I want, which is mark videos that I've already seen as watched. Since I follow a fair amount of channels, it's useful to keep track since I can't always remember.

Exactly what I was looking for. All videos are marked.

Hi! Pleasse make the "opacity" slider or the "background-color" option for /* yourect watched fadeout */

Simple and working!

If one day, you could add a list of all watched videos, would be even more great.

simple and elegant and works, what more could you want?

great and superb

it does what its supposed to .
what more to say ?
youtube is garbage and this addon is covering the smell and making it bearable

tnx!

been searching for fix of this youtube issue for a while, this addon seems to do the trick

Fixed my problem with default youtube not marking my videos as Watched.

Scoured the net searching for this particular thing. This is the best among others that offer the same features. I hope it will continue to be updated. Thanks dev.