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My Firefox does not stop to reset, it's the second time in 4 days

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for example, yesterday I was on Youtube quietly, and my Firefox crash and ask me to restart it in safe mode or refresh, and when I click refresh, it's down to all my data that have been removed, fortunately I use often firefox sync but that does not save all my data ...

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When you refresh Firefox, an Old Firefox Data folder is added to your desktop, which you can use to [[Recovering important data from an old profile#w_copying-files-between-profile-folders|recover missing data].

Hope this helps.