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Possible Duplicate:
How to install Firefox 3.6 and 4.0 in parallel?

Is there any way to install Firefox 3.6 in Ubuntu 11.04? I need Firefox 3.6 because Firefox 4 does not support Google Gears which is required for Offline Gmail and Google explicitly stated that they are not going to update Gears for Firefox 4.

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You can download it from Mozilla site, extract the tar.bz2 file somewhere in your home and execute the firefox file inside it. See my tutorial for step-by-step instructions.

I would recommend using a separate profile for the 3.6 account. You can use the Mozilla's Profile Manager to create profiles and start different versions of Firefox.