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Ctrl-C and Ctrl-V are not working when I am on Firefox on a MAC OS. Why?

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When I am on a Windows PC and access a secure site through Firefox I have not issue with using Ctrl-C and Ctrl-V to modify a document. Yet when I access a secure site through Firefox on a Mac OS I cannot use the Ctrl-C and Ctrl-V feature on my keyboard to modify a document. Any ideas why I am having this problem and how to resolve it?

When I am on a Windows PC and access a secure site through Firefox I have not issue with using Ctrl-C and Ctrl-V to modify a document. Yet when I access a secure site through Firefox on a Mac OS I cannot use the Ctrl-C and Ctrl-V feature on my keyboard to modify a document. Any ideas why I am having this problem and how to resolve it?

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Unless there is something special about your Mac, you need to change to using Command+C to copy and Command+V to paste.

https://support.mozilla.org/kb/keyboard-shortcuts-perform-firefox-tasks-quickly#firefox:mac:fx57