Unable to insert image from clipboard in Firefox 10

Problem Description

Whenever you tried to paste image from clipboard in Confluence rich text editor by using Firefox 10 and above, you can't save the page or preview it. It will be returned as Broken Image. It will not be reproduced using Chrome and Firefox 9.

Steps to reproduce

1. Access Confluence using Firefox 10
2. Copy image to clipboard (You can achieve this by printscreen)
3. Paste to Confluence Editor.
4. Click Preview or Save.
5. It will return as Broken Image