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Alternatively, you can add a boolean "extensions.checkCompatibility" field in about:config and set it to false.

Much more elegant solution, modded up! :)

I did that but it somewhat defeats the purpose of the whole thing. The problem is that some of the add-ins do NOT work with the beta version so overwriting the check is kind of an exercise in futility

It didn't work. Not compatible with version beta 4

Hmm, I must've installed it before the upgrade.

See if you can install it on firefox 2, disable compatibility checks, then open firefox 3.

Actually, try this instead:

https://addons.mozilla.org/en-US/firefox/addon/6543

Thanks I will try that