Firefox Plugin for Private Proxies?

I have a list of private proxies but the tools that I can find, have tried, in FireFox don't have support for the user and pass? What plug-in can I use that will help me to use my private proxies? Please Advise

promoter7 said:

I have a list of private proxies but the tools that I can find, have tried, in FireFox don't have support for the user and pass? What plug-in can I use that will help me to use my private proxies? Please Advise

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See here:
http://www.blackhatworld.com/blackhat-seo/proxies/242737-proxy-tool-addon-firefox-chrome.html

We are working on upgrading Proxy Tool Addon for FF that will have the private IP HTTPS username/password authentication included as part of the private proxy list. I'm hoping to have the newest version released in few days.

Hope it helps.

I use foxyproxy to switch proxies. I believe firefox shound prompt for user/passwd if the user is authenticated