MikuTube

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MikuTube adds a Hatsune Miku image overlay to all YouTube thumbnails whenever you are browsing YouTube. You can also turn on Miku Beam mode which instead of a image of Hatsune Miku it will add a overlay GIF of Hatsune Miku doing the famous Miku Miku beam. The user can set a chance that this will occur for a thumbnail so the user can have a mix of Hatsune Miku images and Miku Miku beams.

Screenshots from Chrome Web Store