Right Click Detection for Firefox

Answer 1

If you don't mind using jQuery, there exists a Right-click Plugin that makes this much simpler.

Answer 2

Testing this in Firefox 3.6.4/Mac worked as expected:

document.onclick = function(e) { 
    var rightclick;
    if (!e) e = window.event;
    if (e.which) rightclick = (e.which == 3);
    else if (e.button) rightclick = (e.button == 2);
    alter(rightclick);
}

Perhaps you're not attaching the click handler correctly?