The Firefox 2 browser breaks numeric access keys. Yes, it’s true. Firefox 2 now requires the Shift key to the Alt + Access Key function, but it doesn’t work with numbers. How silly. A large portion of sites (including mine) that implement access keys use numbers because they are least likely to interfere with various user agents.
But now, there’s a solution! Firefox 18.104.22.168! It’s available through Firefox’s auto-update. Shift + Alt + Access Key now works fine.
In IE, the access key usage hasn’t changed; it’s Alt + Access Key, then Enter.