I currently manage my proxies through firefox profile.
That is each proxy is its own person/profile.
Is their another browser that can do the same thing.

Is there any reason why you're not using Proxy Tools FF addon?:

Code:

http://proxylist.co/tools.php

The FF Addon (plugin) allows you to change the proxy on the fly, on new tab load, clear cookies, etc.

A follow up question
I currenty am use newipnow for my proxies Great service
But i need a proxy located in

Canada
south Africa
and the UK

any one have a good suggestion?