Run Firefox multiple times from different locations

I want to open 10 instances of Firefox (or another browser if not possible) with different proxies in each one of them. I have downloaded "Firefox Portable" and installed in a two different locations, but I can't open them up at the same time - I have used the command -no-remote-, but it doesn't work when Firefox is located in a different locations.

Is it possible to open Firefox multiple times while they are on different locations? if not, how can I run 10 instances of browser with different proxy on each?

Thanks.

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