Here's a useful tip to keyboard enthusiasts who use Mozilla. If you've used Windows versions of Mozilla (and most other browsers for that matter), you know that you can tab through all of the input elements on a web page - links, forms, checkboxes, radio buttons, etc. With the Mac version of Mozilla, though, you can only tab through text entry fields on a form - drop down lists, buttons, links, etc are all inaccessible via the keyboard. Even if you set "Any control" in the Keyboard Preferences pane, you still can't access these other fields. Fortunately, there is an answer - if you add the following to your user.js file:
// Enable tabbing to all fields in a form,Restart Mozilla, and you will now be able to access all links and form controls by just tabbing through the selections. The user.js file can be found in ~/Library -> Mozilla -> Profiles -> LOGIN -> RANDOM.slt, where LOGIN is your profile name, and RANDOM is a random string of 8 characters assigned by Mozilla.
// as well as links.
user_pref("accessibility.tabfocus", 7) ;
Mac OS X Hints
http://hints.macworld.com/article.php?story=20021202064800884