Add a text label (editable through a preference setting) to your Firefox icons in OS X (only). If you're running Firefox with multiple profiles on OS X, you know you want this.
This add-on is available at https://addons.mozilla.org/en-US/firefox/addon/fosx-label/
Inspired by custom-badge by evacchi, who first showed that this was even possible. Thanks!
See evacchi/firefox-custom-badge#3
