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Can't find XPCOM, uninstaller doesn't work

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I'm getting the "Can't find XPCOM" error, so I googled it and it told me to uninstall and then reinstall Firefox. However, if I click on "Uninstall" in the control panel, nothing happens. At all.

If it helps, this all happened after I had to run a system restore.

Can I fix this manually? I'd quite like to keep all my browsing data.

I'm getting the "Can't find XPCOM" error, so I googled it and it told me to uninstall and then reinstall Firefox. However, if I click on "Uninstall" in the control panel, nothing happens. At all. If it helps, this all happened after I had to run a system restore. Can I fix this manually? I'd quite like to keep all my browsing data.

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