Rated 5 out of 5 stars

The buttons look perfect. However, when using the Large Back Button, the area that triggers is covers too far above, and covers have the File toolbar.

EDIT: Installed the 1.1.3pre3 and the problem has been fixed. Now 5/5 starts, perfect add-on!

This review is for a previous version of the add-on (1.1.2.1-signed). 

Yes, I know, this was reported before. I uploaded already a fixed version as devbuild.
https://addons.mozilla.org/addon/cstbb/versions/1.1.3pre3