Bug? Firefox, Silverlight and major resolutions

Hello

We are a company with Firefox 24 deployed to over 2000 PCs. We have an Intranet with Silverlight application works well with this version of Firefox. But now we want to update Firefox 33 and test we found that this does not work with the Silverlight application with large screens. It seems to be linked to the resolution of the screen, or at least the size of the Firefox window. The problem is that the mouse pointer does not appear to be shot where he is. It is best explained in this screencast, where you can see that in a window of Firefox 1024px it works OK, but when is there 1920px it does not work: https://www.youtube.com/watch?v=DA9DLYc-vpE

We tried different versions of Silverlight, currently 5.1.30514.0
I don't know in which version of Firefox, it began to appear that bug. With Internet Explorer, it works.

Any idea?

THX! I filled a bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1105642

Tags: Firefox

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