This extension allows you to add bookmarks to YouTube videos
Image from store
(2018-12-07) Disciple de Jésus-Christ: marche pas
(2018-06-28) user135711: Yes, it works on 6-28-18! The others don't. Two suggestions: add a configurable hotkey for bookmarking and edit the layout so that you don't have to zoom out for the bookmark section to be visible.
(2018-03-21) Eric Stephens: Other YouTube bookmarking tools seem to have stopped working but this one still does!
(2018-03-21, v:1.0) Eric Stephens: Sharing the bookmarks? Martin,
Are you still developing it?
I'd really like the bookmarks to include the timestamp so that they can be shared.