Alerts you to live streams that match your search. Supports these sites: FC2 Live, CaveTube, SHOWROOM, Stickam JAPAN!, TwitCasting, Twitch, Niconico Live, Himawari Stream, FRESH! (AbemaTV), Whowatch, Periscope (Twitter)
Features and design are referenced from Live Seeker (Distribution has ended). Icon used in the userscripts management screen is taken from サムネ職人.
And, I assemble jsen to validate using JSON-Schema, favico.js to display number of hits on Favicon, and CSS.escape polyfill to apply polyfill for Microsoft Edge.