Hides most of the random, unrelated videos which YouTube injects into search results, but still allows you to access them. This script gathers videos from categories like "People also watched" and "For you" and collapses them into thin boxes on-screen so they won't distract from actual search results. Hover the mouse over these boxes to show their contents.
Life improved 1000000×. The only feature it's missing is hiding Shorts in the Subscriptions page as it might be new. Hope the dev can fix asap.