Awesome. Rated 4 out of 5 stars

Awesome extension. A real saver of the eyes. But on gmail, the css parsing does not complete (and not able to edit), else would have given five stars!

This review is for a previous version of the add-on (0.14.1-signed). 

Hi justin,
this is an error that you found, and you were the first. :-)
Sorry for that. I identified it and will correct it in a a future release. Won't promise a date for the release though yet.

Thank you for reporting.