R – Firefox 3.5.3 Windows + Flash + swfobject wmode problem

@Theo.T, thanks for the tip. It didn't solve my problem though, but searching around for how to use ExternalInterface led me to a page saying IE wouldn't receive calls from flash when the container was hidden. My container wasn't hidden, but the height was set to 0:

<div id="flashcontainer" style="height:0">

Setting the height to 1px solved the problem and Firefox now successfully receives the calls from Flash

The right-click JS hack works in opaque and transparent mode because the browser is rendering the Flash inside its own display tree. In this mode, the browser receives mouse events, allows them to be handled by JS, then passes them to the Flash plugin. (This is the reason why there are bugs with entering accented or non-latin characters in transparent mode, because some browsers don't pass them through properly).

In the other window modes the Flash object is not part of the html DOM in the same way. Instead it is just given a rectangle of the display and can draw to it directly. It also gets its keyboard and mouse events from the OS directly, so I wouldn't expect any JS context menu hacks to work in any mainstream browser.