Firefox 6 javascript in addressbar

Whatever I type after "javascript:" in the address in firefox 6, firebug says "uncaught exception: ReferenceError: document is not defined". If I try window, it says "uncaught exception: Refer开发者_运维技巧enceError: window is not defined."

If I type the same code in the firebug command line, it works. What gives?

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This behavior was filed as a in the Mozilla project and resolved per this bug report.