I'm using latest version of firefox (38.0.5 currently) and I need to use proxy configurations only for some URLs and not for every page.
After searching, I found an Addon for Firefox named AutoProxy but after I installed I can not use its preferences to add rules and the defined rules and rules groups are all not visible and this is what I see in preferences:
And when I press "Add proxy rule..." button nothing happens.
Is there any other similar addon for Firefox to define proxy rules for automatically enabling proxy for some URLs and disabling for all others?