Good, BUT ... Rated 2 out of 5 stars

It is a fine idea to have the right proxy ready when needed, but without controlling which proxy to use and not knowing the used proxy makes it useless to me.
How to trust a proxy if I don't know who is behind?

Otherwise not very bad for general use, but be careful where you use it.

Remember to disable it for banks, ebay, paypal, skrill, web mail, etc even with secure HTTPS sites because your account may be locked for ever, and the info could be compromised.

This review is for a previous version of the add-on (1.2.1).