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Thread Starter 
the latest update of Firefox has a new 'feature' which enlarges the page: this was designed for larger, high resolution monitors:

http://www.mozilla.org/en-US/firefox/22.0beta/releasenotes/

https://support.mozilla.org/en-US/questions/963759

if this bothers you (as it did me) try the No Squint 2.1.9 add on: it is free and allows you to custom adjust the zoom level per page, or other suggestions in link