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Music recognition. Like shazam or soundhound.
Wiktionary lives in the context menu. Easy-to-read popup that won't slow you down.
Loop portions of html5/webm/other videos and audio e.g. loop a 1minute video from 00:05 to 00:15.
Ever had a video stuck buffering no matter what, forcing you to reload the entire tab? No more.
Avoid opening duplicates. Moves existing tab of clicked links to next tab.