Rated 4 out of 5 stars

Wish you could make an e10s version, other than that the add is great.

This review is for a previous version of the add-on (10.36). 

The extension version compatible with e10s is under development, and will be available soon.
In the meantime, you can try our Translation Comparison extension which is e10s compatible: https://addons.mozilla.org/en-US/firefox/addon/translation-comparison/