Greasy Fork is available in English.
Search YouTube without interrupting the video, by loading the search results in the related video bar
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Note: Doesn't work with Material Youtube (yet)! [Script to automatically restore classic youtube](http://greasyfork.icu/en/scripts/34818-youtube-restore-classic)
If you also want to be able to create a queue with videos to play after your current video has finished, you can use Youtube Play Next Queue.