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I want to uninstall Firefox but it tells me to close it first; how?

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I found there was little support for Firefox, so I want to uninstall Fire fox. But, it (windows 10) want me to close Firefox first. How can I do that?

I found there was little support for Firefox, so I want to uninstall Fire fox. But, it (windows 10) want me to close Firefox first. How can I do that?

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Use the Quit or Exit command in the menu or the keyboard shortcut to quit.

https://support.mozilla.org/en-US/kb/keyboard-shortcuts-perform-firefox-tasks-quickly

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Boot the computer in Windows Safe Mode possibly with network support to see if that allows to uninstall Firefox.