I post my style for hreflang on UserStyles.org, which allows us to share user styles. With Firefox, we can "install" it via the Stylish add-on, an extension who allows to adds and manage styles that we normally put in UserContent.css. Note it's too possible (in others ways) with IE, Opera, Safari, Greasemonkey, and probably other browsers.

• Here is the style for proper display the target link language (hreflang).
• As the page language is now always well-informed, I make a second rule who always display the hreflang attribute, except where the language is specified and is the same. This works on most sites, but does not cover all possibilities

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