P4TB-246: Follow-up, even more tweaks to the Options panel to make it look good on Mac: Lose ugly focus ring.

addon/content/dialogs/options.css

@@ -84,6 +84,11 @@ label.text-link {
     color: #00A748 !important;
 }
 
+label.text-link:-moz-focusring {
+  outline: none !important;
+  box-shadow: none !important;  /* For Mac */
+}
+
 label.donate {
     color: black !important;
     border-radius: 0.5em;