From April 7th, 2018 to January 25th, 2019, 50% user give 5-star rating, 50% user give 1-star rating. for Mail 3.0 chrome extension.
Doesn't do a thing, according to the instructions, I'm supposed to get a passphrase soon after I install the extension and open my gmail inbox, but I get nothing. The instructions also say to compose an email as normal, then hit the 'Mail' icon to encrypt it, nope, doing that only shows a drop down menu to either open the web page, remove the extension, etc etc,,, sooo, nope it don't work, sorry!!!!!
Biased (I helped make it!) but I think the app is very useful and I use it for my communications.