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Firefox 5.0 Update downloaded automatically without my permission and is threatening to install the next time I shut down. How do I stop it? (This version has not been approved by the development platform I use.)

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Firefox 5.0 Update downloaded automatically without my permission and is threatening to install the next time I shut down. How do I stop it?

Firefox 5.0 Update downloaded automatically without my permission and is threatening to install the next time I shut down. How do I stop it?

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Remove the files in the updates and updates\0 folder.
You may need to delete active-update.xml and updates.xml as well if present.

C:\Users\<user>\AppData\Local\Mozilla\Firefox\Mozilla Firefox\updates
(%LOCALAPPDATA%\Mozilla\Firefox\Mozilla Firefox)
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That path doesn't exist on my computer. I've spent some time looking for any "updates" folder with no success.

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The "Application Data" folder in XP/Win2K and the "AppData" folder in Vista/Windows 7 are hidden folders.