updated comparison tables

Author: jongund

content/practices/color-settings/color-settings-practice.html

@@ -1261,7 +1261,7 @@ <h3 id="computed-system-colors">System Color Support</h3>
 
         <h3 id="system-colors">Supported System Colors in Contrast Themes</h3>
 
-        <p>The following list of colors are considered "safe" to use when a user enables a contrast theme.  Safe colors are color that use one of the theme colors.</p>
+        <p>The following list of colors are considered "safe" to use when a user enables a contrast theme.  Safe colors are color that use one of the theme colors and are supported in both Mozilla and Chromium based browsers.</p>
 
         <ul id="usable-system-colors">
         </ul>