The current translation is correct but it looks odd as if there was a comma (oh, I forgot to say that the link won't be sent by mail but by email): "Envoyer un lien vers la page, par courriel". "Envoyer le lien par courriel" is shorter (better for a menu) and more correct but it doesn't explain which link is. I think "Envoyer par courriel un lien vers la page" is better.
Thanks for the report! :) http://hg.mozilla.org/l10n-central/fr/rev/f8b123c2f87a http://hg.mozilla.org/releases/l10n/mozilla-aurora/fr/rev/0a4d9de6f782