Ever visit a site which automatically resizes your browser window? This may be a big no-no in web design, but some people still do it regardless of what may be good and right in webdev rulebook. There’s an easy way to stop sites from doing this, assuming you’re using Firefox (which you should be).
Once you save all your changes, Firefox will not be bothered by those nasty window resize scripts. There is also a more involved method of configuring the same option by using about:config, but I won’t get into that since the above method is much easier to do and follow.