YouTube (un)cookify от blemasle

Using this extension, you'll be able to easily watch YouTube videos without impacting your watch history. Plus, no more sign in and agreement pop ups ;)

Simply click on the YouTube (un)cookify button on any YouTube watch page to switch that page to YouTube enhanced privacy website (youtube-nocookify.com)

The button can be middle-clicked to open a new tab.

You can also open YouTube video links directly in a new tab from the context menu.