mozilla/tabzilla — pull request #45 by craigcook (2012-10-04 22:55:22+00:00)
Title: Avoid data: URIs for IE7

IE7 interprets the data: pseudoprotocol as unsecure content and throws warnings on secure pages. This replaces the background image with a dotted border. Of course, IE6 will display dashes instead of dots but maybe we can live with that?

We're still using an embedded image for the arrow icon but that should be fine since IE6/7 don't support the :after selector for generated content, so they ignore that whole rule. IE8+ don't have a problem with data: URIs.