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When I switch between tabs the page jumps down about 20 lines. Why? And how do I stop this?

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I am running on Mac, OS X 10.9.1 .

When using Firefox if I switch between tabs or open a new tab from a link the page will jump down about 20 lines. This does not happen on all websites. Most notably on Facebook, but a bunch of other sites do it as well.

Help would be nice.

Thanks

I am running on Mac, OS X 10.9.1 . When using Firefox if I switch between tabs or open a new tab from a link the page will jump down about 20 lines. This does not happen on all websites. Most notably on Facebook, but a bunch of other sites do it as well. Help would be nice. Thanks

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Try clear your recente history:

Also: