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Firefox cleses by itself and when restarted looses presets

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Presets return to Firefox default after restart .

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One possible reason for this is if Firefox did not get permanently installed into the Applications folder but is running from the DMG (installer) file. Could you double-check the steps in the following article to see whether you can get that permanent installation going, and also check your icons to make sure they link to the correct Firefox.

How to download and install Firefox on Mac

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