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My screens are jumping up and down and I cant stop them. Help?

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The screen when I log on to Firefox jumps up and down. Extremely annoying especially when Im doing homework. :) If I log on to another provider it doesn't jump. Please advise. I really like Firefox and would like to continue using.

The screen when I log on to Firefox jumps up and down. Extremely annoying especially when Im doing homework. :) If I log on to another provider it doesn't jump. Please advise. I really like Firefox and would like to continue using.

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