Let Emacs handle mailto:

Well Firefox is a web browser only and it doesn’t come with a mail client, so it will call the system default mailer to handle “mailto:” links.
It is hard to say how to define the system default mailer. It’s different according to your OS: On windows they use registry, in the Unix world it depends […]

win key and menu key

I can use xev to see what key I just pressed. Also the Emacs
C-h k runs the command describe-key
which is an interactive compiled Lisp function in `help’.
It is bound to C-h k, <f1> k, <help> k, <menu-bar> <help-menu> <describe> <describe-key>, <menu-bar> <help-menu> <describe> <describe-key-1>.
(describe-key key &optional untranslated up-event)
Display documentation of the function invoked by key.
key […]

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