Posted by JT as a 'news' item ... brought here also;
QUOTE
Nov 1, 2006

[10:53 EST] If you upgrade to Firefox 2.0, you might notice that the old shortcut key presses don't work any more. Mozilla has changed the way you need to activate these keys. Here is the information from their release notes: Access key definitions provided by web pages can now be triggered using Alt+Shift+key on Windows, Ctrl+key on Mac OS X, and Ctrl+Shift+key on Unix.