Greasy Fork is available in English.
A tampermonkey script that can detect and copy the timestamp of the current YouTube video and put it at the end of the URL when activated, and replace the current URL with the contents of your clipboard. Press the keybind again (Shift+s) to remove the old timestamp and replace it with a new one.
While focusing on a YouTube video, pressing shift+s will copy the timestamp to your clipboard, paste it into the url, then "refresh" the browser so the new timestamp is saved. I use this to preserve the tab whenever I have to leave the computer or reach a point in the video that I want to return to often, or to paste to friends, etc.
