Thanks for participating in our answers forum! The first thing that I would check is, are you using Adobe's Flash plugin Beta 10.1? If so, try removing that and installing a stable version of the flash player.
Hope this helps!
The Sling Media Moderation Team
Thanks for the suggestion but that did not help! I am running Shockwave Flash 18.104.22.1687 and Slingbox player continues to crash Firefox with the stated error.
Notice there is no "Disconnect" buton on the Slingbox Player as there is on the Ipad App! I have no problem closing the Ipad app or the Iphone app on the computer app.
So I still look for an answer.