The solution here is simple -- lobby W3C to include custom scrollbar colors in the CSS specs, then call out Mozilla for not following the standards. As it is,

The solution here is simple -- lobby W3C to include custom scrollbar colors in the CSS specs, then call out Mozilla for not following the standards. As it is, colored scrollbars are not part of any standard, so asking for them are like asking Google or Mozilla to support ActiveX for your webapp -- if you rely on non-standard, proprietary features, you're locked in to your non-standard browser.