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My version was automatically change to a developers version erasing everything I had saved and my history, why, and how can i change it back

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I opened my laptop and my firefox/aurora globe was blue... it apparently is a developer version. All of my bookmarks and tabs are gone and I want my old version back...

I opened my laptop and my firefox/aurora globe was blue... it apparently is a developer version. All of my bookmarks and tabs are gone and I want my old version back...

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Suluhisho teule

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Thank you!!!!!