Chrome: YouTube has its share of annoying behaviours, and plenty of extensions and scripts exist to correct those behaviours. YouTweak is another tool for your arsenal, but it takes on some newer annoyances, including subscription videos and history.
Much like the previously mentioned YouTube Options, YouTweak is all about getting rid of some minor annoyances. YouTweak is built more for the YouTuber who uses a lot of subscriptions, and it fixes a lot of annoyances with the way the system works.
Namely, you can get rid of the "watched videos", so your history isn't saved, alter the behaviour of the "my subscriptions" bar, and you can remove videos from your subscription page entirely. YouTweak isn't nearly as varied as YouTube options, but it's especially useful if you use the subscription services.