Multiple Firefox Portable Instances

I've found out that the simplest way to run multiple versions of Firefox side-by-side without having to engage in Profile Manager acrobatics/silliness is to use Firefox Portable and just set AllowMultipleInstances=true in FirefoxPortable.ini.

FirefoxPortable.ini can be found inside the Other/Source directory, but the trick is that you should copy it to the main directory (e.g. Other/Source/../.. or, in other words, FirefoxPortable/ if that's what you named your main directory) otherwise it won't work.

I discovered this great tip thanks to this page:

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