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When I customize things like homepage, privacy, history they all change back to Firefox default when I close the browser

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Firefox will not remember my customized options. I set my homepage and privacy options and when I close the browser and reopen, it will be back to Firefox default homepage.

Firefox will not remember my customized options. I set my homepage and privacy options and when I close the browser and reopen, it will be back to Firefox default homepage.

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Sounds like you could have a locked or corrupt preferences file. Try this article for steps to fix that - How to fix preferences that won't save.