Filter videos on your youtube subscription page based on your own categories.Allows users to create their own categories of youtube subscriptions, which are then filterable on the youtube subscription list page.
E.g. create a category for "Music", then add all your music subscriptions to this category. On the subscriptions page, this new category will be in the filter select box. When you change the active filter all non-music videos will be hidden (until changing the filter again).
Note: The filtering only shows videos that would be shown in the page state with no active filter selected (it may for instance hide *all* videos, requiring you to scroll down and load more to see more).
It uses vanilla (es6) javascript with no libraries, so the filter process is very quick, though when new videos are loaded in there may be a brief moment where you can see all new unfiltered videos loading in before the extension hides them.
Reviews of Simple Youtube Subscription Filter extension