Does @font-face load all fonts to the browser

I've been starting to use @font-face in the last year or so seeing that most major browsers support it now. I usually just use 1-3 fonts max, but most often I include the italics version, bold and italic bold version, which can easily amount to a couple MBs of data minimum (depending on the font). Since I use EOT, TTF, WOFF and SVG to work in most browsers, the filesize augments. I don't want too much bandwidth (and load time) used, so I was wondering: if Firefox (or any browser) successfully loads the EOT version of the file, will that browser still download all 3 others or it will specifically ignore the rest?

I know some of you might say "well, bandwidth nowadays...", but I still prefer to keep things minimal by habit.