I'm also using [0] which displays mentions of a site on reddit.
(And while you're at it, one [1] that replaces youtube comments with reddits comments from the subreddit threads where a video was posted to.)
[0] https://chrome.google.com/webstore/detail/reddit-check/mllce...
[1] https://chrome.google.com/webstore/detail/karamel-view-reddi...