Windows 10 bereikte EO (einde ondersteuning) op 14 oktober 2025. Lees voor meer informatie dit artikel.

Windows 10 reached EOS (end of support) on October 14, 2025. For more information, see this article.

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My firefox lost all data of my settings and reinstalled itself

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It started after the power went out I went to open Firefox and it acted like it was installing for the first time and it lost ALL of my settings. These settings were really important and I need them back. I had Firefox sync setup for this very reason but I could not figure out how to sync the browser with the settings that were synced with my account.

It started after the power went out I went to open Firefox and it acted like it was installing for the first time and it lost ALL of my settings. These settings were really important and I need them back. I had Firefox sync setup for this very reason but I could not figure out how to sync the browser with the settings that were synced with my account.

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Hi, first look on your Desktop for a folder named Old Firefox Data (see Refresh Firefox - reset add-ons and settings). If it isn't there, for bookmarks only, you can try this: Open bookmarks > Show All Bookmarks > Import and Backup > Restore, and see if you have a backup there.

If not, and for other settings please see -


Incidentally, you have more than one version of Shockwave Flash - which can cause problems, so all but the latest should be removed from your machine -

If your question is resolved by this or another answer, please take a minute to let us know. Thank you!

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These can't get your data back, but will help in the future.

These add-ons can be a great help by backing up and restoring Firefox

FEBE (Firefox Environment Backup Extension) {web link} FEBE allows you to quickly and easily backup your Firefox extensions, history, passwords, and more. In fact, it goes beyond just backing up -- It will actually rebuild your saved files individually into installable .xpi files. It will also make backups of files that you choose.

OPIE {web link} Import/Export extension preferences