Use the official CSS3 properties border-radius and box-shadow (not only -webkit-specific properties).
Fixes analyzer's diagnostic pieces in HTML diagnostics mode in Firefox and other non-webkit browsers.
Before:
After:
Not sure, do we need more reviewers? - it seems that HTMLRewrite is mostly used in the analyzer. Also, are there html/css gurus around? Cause the best thing i can do is trust the "a lot of green boxes" feeling at http://caniuse.com/#feat=border-radius and http://caniuse.com/#feat=css-boxshadow :)