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I used to be able to navigate downward in web pages in Firefox on Windows 7.

I just installed Firefox 4 and can no longer do this.

I tried going back to version 3.6 but the problem has been carried back to that version too.

How can I restore the original functionality?

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Works fine here, Firefox 4 / Windows 7. Have you tried unplugging/replugging your keyboard ? Updating drivers ? – Isaac Clarke Mar 24 '11 at 21:22
Drivers work fine. No problems with keyboard in other browsers or any other applications. – Charles Scowcroft Mar 24 '11 at 22:18

It seems an addon has reserved that 'HotKey'. I recommend you start Firefox 4 with all addons disabled (i.e. Safe Mode) and see.

The key works fine on my FF4 + Win7x64

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