Firefox: Test large window size

I need to test a website in Firefox at a window resolution of 3,500 px wide by 600 px tall.

The biggest I can stretch my Firefox window is 1,600 px wide.  I have tried several Firefox extensions that let you change window sizes but none will test 3,500 px wide.

How can I test at this size?
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Steven VonaCommented:
I dont think you can unless you get a monitor/video card that can handle that resolution.
That is depending of your screen resolution. Buy monitor with that resolution or better some TFT Flat wilde screen TV and use like PS3 to connect to that site or connect to your PC as external monitor.  
No problem with my laptop + external monitor.
This is your question with window over 3700w x 700h

Firefox 3.6.13 on Win7Ult

3773w x 737h
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hankknightAuthor Commented:
My video card cannot handle that resolution and I do not have a laptop with an external monitor.  Is there no way to test this?
Yes. With the proper hardware.
It couldn't get much simpler.
Use this free resolution testing service:

Note that for resolutions higher than your screen size permits, you need to select 'Frame' as display method.

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