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Downloaded Firefox 80.0 but haven't restarted yet; how do I delete the update to keep 79.0?

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Windows 7 Pro 64bit

I've downloaded Firefox 80.0 but haven't restarted to install it yet; DuckDuckGo is useless, I can't find any information about where this update is stored so I can delete it and keep 79.0.

Windows 7 Pro 64bit I've downloaded Firefox 80.0 but haven't restarted to install it yet; DuckDuckGo is useless, I can't find any information about where this update is stored so I can delete it and keep 79.0.

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Why do you want to keep Firefox 79 instead of using Firefox 80??

I think this is where updates are staged for installation, but there may be other relevant files that instruct Firefox to check here at startup:

C:\ProgramData\Mozilla\updates