How to lock firefox version?

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http://askubuntu.com – I would like to lock firefox version in ubuntu 10.10 as we are running our software in firefox version 3.6. Coz of this we are unable to upgrade the latest packages and updates if i do that firefox version is also getting updated to version 10. I just want to lock the firefox version so that it wont be updated. Is it possible? (HowTos)