Rated 2 out of 5 stars

Firefox 50
Not compatible with multiprocess ("Add-on Compatibility Reporter" says it): http://storage8.static.itmages.com/i/16/1125/h_1480104853_5482066_2c13034c4c.jpeg

https://addons.mozilla.org/es/firefox/compatibility/reporter/[email protected]?appver=

This review is for a previous version of the add-on (3.7.2). 

Here is a bug report and a version that hopefully fixes it:

https://www.mozdev.org/bugs/show_bug.cgi?id=26329