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Firefox windows keeps jumping up and down.

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I've downloaded the latest version of Firefox, but I have a slight problem. Every time I open Firefox it jumps up and down. How can I stop it?

This happened

Every time Firefox opened

== As soon I downloaded the latest version of firefox 3.6.6

I've downloaded the latest version of Firefox, but I have a slight problem. Every time I open Firefox it jumps up and down. How can I stop it? == This happened == Every time Firefox opened == As soon I downloaded the latest version of firefox 3.6.6

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