Firefox/Mac - onRightClick works only once for a given row/c

Suite 7.0/6.0/5.0 and Optimus Suite 5.0
#1

Ran into a problem where the onRightClick event only fires once for a given row/column. Tracked the problem down to line 1104:

(ev.srcElement||ev.target).oncontextmenu=z;

Commenting out the line fixes the problem.