Page Down does not work on Firefox

Starting with 3.5.3 and continuing with 3.6 and Ubuntu last, the scroll wheel to move a website from top to bottom, but the keyboard commands Page UP and Page Down do not work. After hitting key a second time, he jumps off the page and press the top back to the top. In addition, a black flashing rectangle appears on the left side of the page. This will disappear when the user clicks on an empty space on the site.
I thought to install the latest version of Ubuntu and the latest Firefox could solve the problem, but he persists.
Any thoughts appreciated.

Ted

This has happened

Each time Firefox opened

Is see description above

Try to hit F7.
http://KB.mozillazine.org/accessibility.browsewithcaret

Tags: Firefox

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