Firefox - Remove dotted line around links

Oh, how annoying that dotted line around linked elements in Firefox is! There are many articles describing how to remove it for your website. I don't like the idea - it should be up to the user to decide. So I, as a user, decided to remove them from my browser. How?

1. Type about:config in Firefox address bar.
2. If it displays a warning, confirm you know what you're doing.
3. Find this property (you can use the filter): browser.display.focus_ring_width
4. Set its value to 0 (zero).

Ahh...