As a result of the UI changes in Firefox 8 with the inverted (white) icons, the add-on App Button Clear does not work correctly. Besides being ‘incompatible’, when the add-on is forced to work in Firefox 8, it turns the App (Firefox) button white instead of clear. However, there is a userChrome.css tweak that will make the Firefox button clear (also works if you are using the Moveable Firefox button add-on). Simply add the below lines to your userChrome.css file and restart Firefox [directions]. /* Makes Firefox Button Transparent */ #appmenu-button{ background: transparent !important; border: 1px solid rgba(0,0,0,0.3) !important; border-top:none!important;…