Rated 4 out of 5 stars

Is it possible to enable Automatic authentication on proxies (bypass popup with login and password), just like Guifiproxy does.
expecting the updates.

This review is for a previous version of the add-on (3.2.1-signed). 

Yes - use FoxyProxy Plus

Hi,

FoxyProxy Plus saves username/passwords for HTTP(S) proxy servers. It's not free, but is very inexpensive:

http://getfoxyproxy.org/fpplus/

Eric