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Constant "profile was last used with a newer version of Firefox" warnings

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I recently downgraded to the stable version of Firefox from beta. I made a new profile and deleted the old one, and it still tells me this randomly. Not sure what to do now since creating a new profile (like it said) didn't work. It's more of an annoyance since everything works like normal, other than getting the error every few hours (or minutes, depends).

I recently downgraded to the stable version of Firefox from beta. I made a new profile and deleted the old one, and it still tells me this randomly. Not sure what to do now since creating a new profile (like it said) didn't work. It's more of an annoyance since everything works like normal, other than getting the error every few hours (or minutes, depends).
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