How to downgrade Firefox to the last sane version (3.6)

So I keep ranting about Firefox here, and for good reason: the Mozilla team is going above and beyond the call of duty when it comes to driving users to other browsers.

However, try as I might, I simply encounter too many dealbreakers in Chromium.

When I think about it, the last version of Firefox that didn’t drive me crazy with crashing, incompatible add-ons, and stupid UI changes and features removed, it would have to be Firefox 3.6.

I keep forgetting how to do this, so I’m posting this here as much for my own reference as for anyone else’s. This is how to downgrade newer versions of Firefox to 3.6 and keep it that way, at least until things settle down a little, or until another browser comes along that can actually be a viable replacement for it — unlike newer versions of Firefox, sadly. This works with Mint 11, which means it will also work with Ubuntu 11.04.

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