One feature of Firefox I find amusing/neat is the about:config URL. It opens a window letting you change the values for any setting for Firefox itself, or your installed extensions. While I had it open for some general spelunking and changing of network settings (sorry, HTTP 1.1 is correct, but sometimes a guy has to have more open connections) I came across this aptly named config setting:

general.config.obscure_value integer 13

UPDATED: Oh