control + click

I am using Firefox and on a MapGuide open source site. Hovering over an object brings up a tool tip stating "control + click to view PDF". On a PC hitting control plus click in Firefox brings up another tab with a link to a PDF file. On the Mac control + click brings up a context sensitive menu.

I have tried a number of different key combinations but cannot seem to stumble upon the combination that gives me the same results as the pc.

Thanks