Display shortcuts in mozilla firefox html display

If you want to see if a web site has keyboard shortcuts, you can show them by adding this to your Firefox profile's chrome/userContent.css file:

a[accesskey]:after,
button[accesskey]:after,
input[accesskey]:after,
label[accesskey]:after,
legend[accesskey]:after,
textarea[accesskey]:after
{
   margin-left: 0.3em;
   content: "[" attr(accesskey) "]";
}

Ref: http://lifehacker.com/5578640/display-a-web-pages-keyboard-shortcuts-in-firefox