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System: Ubuntu 10.04

For testing purposes I need to downgrade from FF7 to FF6. I'm aware of this answer: How to downgrade to Firefox 4 on 11.04 but my Synaptic Package Manager only offers me 7.01, 3.6.3 and 3.6.23 when I go to "Force Version". How is this best achieved?

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You can try following: Download binary of required FF version from this ftp, unpack it somewhere in Your home folder, and run it from there.

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