Plase delete this question. The issue was fixed in recent firefox versions.
marked as duplicate by slhck♦ Jul 25 '12 at 8:46
This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.
Seems like there might be a solution on the Mozilla Support page.
Click Tools>For website authors>Sandbox, enter
You may want to use Firefox with Bing