Works as it says Rated 5 out of 5 stars

Works as it says. However, looking at the code, I saw that the add-on is not cleaning up properly, so if you deinstall or disable, the previously configured URL is still used when opening a tab. Maybe something to improve? (See for how to do that)

This review is for a previous version of the add-on (1.0). 

Thanks for your feedback and yes, you're right. It's already planned for the first update. :)