Simulsync - Watch reactions in sync is a fun chrome extension. it's a free extension , it has 222 active users since released its first version, it earns an average rating of 5.00 from 1 rated user, last update is 569 days ago.
Watch full-length reactions in sync with it's corresponding content on several streaming services. All you need is the link to a YouTube, Vimeo or Streamable video and the amount of seconds into the reaction-video that the reactor hits play. Casper handles the rest. Note that this extension is still in it's beta stage. Go here for a "How-to-use" guide: https://www.simulsync.live/browser-extension
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