Rated 5 out of 5 stars

I will set the excellent mark, but anyway the new version still requires additional improvement. Without some of them, it might be tricky to use it :)
- format XML response (add indentation)
- JSON is not highlighted properly (properties, objects, values have the same color - red)
- when I copy a text from response body (highlight), I get a non-formatted result.
- a minor error, but when I press the Send button, the active tab below is changed to the first tab.
- Manage Favorites always shows me an empty window, however the address bar in the RESTClient contains marked requests with a star.

This review is for a previous version of the add-on (2.0.0). 

Thank you for your review.

The XML indentation, response tab, favorite url bug will be fixed in 2.0.1.

I will try to improve JSON highlight in future version.