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

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

Try clear your recente history:
*[https://support.mozilla.org/en-US/kb/remove-recent-browsing-search-and-download-history Clear recent history]
Also:
*[https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-using-safe-mode Firefox in safe mode]

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