I am using Bootstrap CSS framework from Twitter for my site. I just noticed that bootstrap is breaking some of my css by removing quotes from CSS selectorsBootstrap uses the following CSS selector for elements with classes beginning with icon- prefix[class^="icon-"],[class*=" icon-"]ModPagespeed optimizes this into[class^=icon-],[class*= icon-]After this change, Firefox ignores the leading whitespace and starts matching classes like thumbnails-icon-list.