<body class='domain'> is a Chrome add-on developed by Gible Fog. It is a free program that falls under the category of Browsers and the subcategory of Add-ons & Tools.

Please note that starting from version 33, Chrome no longer supports the custom.css discussed here. However, the developer has decided to keep this extension available for users who may still find it useful for other purposes. It is important to mention that this add-on does not collect or use any user data.

In version 1.4, the add-on has been updated to assign the class value to iframes as well, both for their src domain and the document domain. The requirement for flickr access, which was present in the previous example manifest.json, has been removed in this update.