Some Keys Do not Work in Firefox

Recently, I find the PageDown and PageUp keys do not work in my Firefox 3.6 (both Linux and M$ editions), I used to use them to navigate webpages. I have done Google research, but without any effect.

Did anyone encounter this kind of problem? please kindly leave a comment and show how to solve the problem, many thanks to you!

Update: The solution is pretty easy: Just hit the key F7, it should work. Sounds very simple and easy!


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