An argument for NoScript
If you go to this site, you can push a button that gets the site to analyse your browsing history, and then, using some simple statistics on web-site visitor patterns, determine your likely gender.
I had an 89% chance of being male.
You might feel justifiably concerned that your browser was willing to cough up this information. In particular, a remote site could extract this information without requiring you to first push a button. The information probably isn’t linked to you directly because we assume that the browser is only providing history and not any other details. However, if you’ve just signed up to a site with an e-mail address, then there is a link for free.