UPDATE
Um How does one update Firefox. The help file says to look for the Help menu then select "About".. There is no "about" choice.
Um How does one update Firefox. The help file says to look for the Help menu then select "About".. There is no "about" choice.
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Do you see About Firefox? In any case, this article may help.
https://support.mozilla.org/en-US/kb/how-install-firefox-windows