Silverlight cursor position not right in Firefox

In Firefox 4开发者_Python百科/5, my Silverlight page reports the cursor position lower than where the actual cursor is on the screen. This means that I have to position my cursor above what I want to click on, rather than actually clicking on it.

As I have been investigating more, I can confirm that it works in IE8/9, and in Safari on Mac properly. This issue vanishes in FF 4/5 if I run the browser in full screen mode.

Edit: This only seems to happen when I have dom.ipc.plugins.enabled.npctrl.dll set to false, keeping Silverlight out of the plugin container.

Edit 2: This is a Firefox bug, and seems to have been there in one form or another since they implemented Out Of Process Plugins. See this bug: Mozilla Bug ID: 599992. Guess I will have to wait until this is fixed.