This extension is a fast and user-friendly browser extension. It provides the user with a good estimate of the HTTP compression level of the page being loaded. This can be handy for webmasters and developers to know the compression level of the page, especially in the situations where the compression level cannot be determined automatically (e.g. on the mobile version of a site).

It's function is to record the Content-Length of a certain page as it is being loaded then it tries to compress the levels and display whatever the result may be.