Why does the page not move smothe when i scroll?

Why does the page not move smothe when i scroll?
Sometimes it even move slower then i Scroll?
I use a Mac and i have tried to reinstall the program.

Start Firefox in [[Safe Mode]] to check if one of the add-ons is causing the problem (switch to the DEFAULT theme: Tools > Add-ons > Appearance/Themes).
* Don't make any changes on the Safe mode start window.
In Firefox 4 [http://kb.mozillazine.org/Safe_mode Safe mode] disables extensions and disables hardware acceleration.
* Tools > Options > Advanced > General > Browsing: "Use hardware acceleration when available"
See:
* [[Troubleshooting extensions and themes]]

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