A web page can set an "accesskey" for an element. Unlike IE/Chrome/Safari, which use the Alt key alone, Firefox requires pressing both Alt and Shift to activate the element. In other words, try

Alt+Shift+S

and see whether that works.

I don't know of any way to change this so that the Shift is not required. Maybe there's an add-on??

Thank you, it works.

For future reference, this table lists the keyboard shortcuts for activating an accesskey on various operating systems: https://developer.mozilla.org/en/HTML/Global_attributes#attr-accesskey

Submitted too soon... To change your accelerator key for accesskeys to Alt alone (or a different combination), you can change a setting using Firefox's about:config preferences page.

(1) In a new tab, type or paste about:config in the address bar and press Enter. Click the button promising to be careful.

(2) In the filter box, type or paste ui.k and pause while the list is filtered

(3) Make sure ui.key.generalAccessKey is set to its default value of -1 (or right-click and choose Reset if it is not).

(4) Double-click ui.key.contentAccess to open a dialog box to change the value from its current default (on Windows, 5) to your choice of the following:

• 2 = Ctrl (Fx default on Mac thru Fx13)
• 3 = Ctrl + Shift
• 4 = Alt (IE/Chrome/Safari default on Win/Linux)
• 5 = Alt + Shift (Fx default on Windows & Linux)
• 6 = Ctrl + Alt (Fx default on Mac from Fx14) (Chrome/Safari default on Mac)
• 7 = Ctrl + Alt + Shift

This should take effect as soon as you OK the dialog, so you can experiment in a separate tab. Other combinations are available if you want to try them. See http://kb.mozillazine.org/Ui.key.contentAccess (inaccessible at the moment?)