Windows 10 bereikte EO (einde ondersteuning) op 14 oktober 2025. Als je Windows 10 gebruikt, lees dan dit artikel.

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Firefox is corrupted

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15 minutes ago I tried to open Firefox and got a pop up asking me to initiate an Update. I initiated the update and my computer shutdown. I restarted the computer and tried to go back to Firefox. The Firefox icon had disappeared and a blank icon replaced it. When I clicked on that new icon I got an error message saying that the program was corrupted and unreadable. What should I do? If I uninstall and reinstall I will probably lose the Bookmarks that it has taken me years to develop. Have somehow picked up a virus?

15 minutes ago I tried to open Firefox and got a pop up asking me to initiate an Update. I initiated the update and my computer shutdown. I restarted the computer and tried to go back to Firefox. The Firefox icon had disappeared and a blank icon replaced it. When I clicked on that new icon I got an error message saying that the program was corrupted and unreadable. What should I do? If I uninstall and reinstall I will probably lose the Bookmarks that it has taken me years to develop. Have somehow picked up a virus?

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Hi Jernmim, I'm sorry to hear about this problem.

As the first step, I suggest downloading the full installer and running it. Usually it can find your existing settings and get everything sorted out automatically. Here's the download page:

https://www.mozilla.org/firefox/all/#product-desktop-release

If the installer, or Firefox suggests a tune-up or Refresh, try to skip that to minimize disruption and see whether it works.

Firefox stores your personal data in the profile folder and this folder is located in a different location in the hidden "AppData\Roaming" location, so you should keep your bookmarks and other data if you reinstall Firefox.