Pubget works on any browser that can display PDFs inline. Unfortunately, Firefox supports this capability only on pre-Intel Macintoshes running OS X, and then only when using the Schubert|it plugin. Therefore, we recommend Safari 2 or 3 (Mac or PC) or Internet Explorer 7. (Internet Explorer 6 is supported, but doesn't look as good as more recent versions.) Also, on the Mac, we've found that Safari's native viewer is faster than Adobe's.