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My antivirus(Kaspersky) add ons are not compatible with Firefox 30 so I would like to downgrade back to firefox 29.

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How do I downgrade back to firefox 29?

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Mozilla.org maintains a publicly accessible archive of all past versions of Firefox. The link to it is located in the middle of the following page:

https://support.mozilla.org/en-US/kb/install-older-version-of-firefox

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Why don't you just update Kaspersky?

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I'm not the one with the problem.

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Thank you goldensword!