good but should be better Rated 5 out of 5 stars

Nice addon! Good workround!

This review is for a previous version of the add-on (0.5). 

Thanks!

I've updated the add-on and it now addresses mixed content for sites like https://www.google.com/reader.
Please check it out
https://addons.mozilla.org/en-US/firefox/addon/site-identity-button-colors/versions/

Thanks again for the review and rating