Re: On my mac how do I send an attachement from Firefox to a 3rd party? I have been unable to locat the proper icon.
Firefox doesn't have a built-in emailer, so I'm guessing you are using your provider's webmail site. Each site has different buttons for adding attachments. Do you want to indicate which one you're using to see whether anyone can provide specific comments?
Also, your browser reported to the forum that you are running Forefox 3.6.13, which is a very old version with numerous publicly disclosed security vulnerabilities. Is that version number correct? (You can compare Help > About Firefox)