I request everyone to read this before downloading an unknown chrome extension-
https://www.reddit.com/r/Bitcoin/comments/23sjle/chrome_extension_just_stole_my_btc  (This is about one type of malicious chrome extension that stole BTC)

If you love our account and not want to get screwed, beware of such services. I know OP already mentioned that the chrome extension is hosted on GitHub but dont just swayed by that information. Because OP already knows more than 5% members here doesn't know any coding and by seeing something hosted on GitHub will give a firm implication that the extension is 100% safe.

That's my warning for you guys. Now its your choice.