Rated 2 out of 5 stars

One big safety issue: Phishing will become a lot more dangerous because this way you cannot see the address of the site you're browsing.

This review is for a previous version of the add-on (1.1-signed.1-signed). 

The identity block should help you decide if you should trust the website. There was a bug in v1 where the block (and favicon of the page) would not show up. This has been fixed in v2.