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I need to delete Firefox 11.0 please. I meant to install Firefox 9.0.1.dmg

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I installed Firefox 11.0 by mistake. How do I delete it, so that I can install Firefox 9.0.1.dmg for the Concord Desktop Version?

I installed Firefox 11.0 by mistake. How do I delete it, so that I can install Firefox 9.0.1.dmg for the Concord Desktop Version?

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Firefox 9 is no longer secure. Using it can expose your computer to attack. You should continue using Firefox 11.

What is it that you were hoping to solve by using Firefox 9? Maybe we can work on solving that problem.