Remove older Youtube videos from subscription feed, edit to customize threshold. It does not work on "loading more" videos (the script is not re-run when the page changes) - so just don't scroll down...
Hides the videos older than an arbitrary threshold in your Youtube feed that just resurface without explanation even when already watched. The threshold can be simply set by choosing the exact "age" strings to be matched. Does not work once the page is reloaded with "more videos", so just don't scroll that far down the page (or fix it to run again each time the page changes)...
