Back in February we mentioned Extension Signing Coming Later in 2015. Recently the Mozilla Add-ons Blog posted a follow up The Case for Extension Signing. There is a lot of interesting information in this article, including this very shocking statistic which puts into prospective just how badly broken the current Mozilla Firefox add-on system is: The Web experienced by tech-savvy developers, however, is not the Web experienced by most people. While only fourteen add-ons hosted on our addons.mozilla.org site have more than a million users, and only two of those have more than 3 million, many tens of millions of users have non-hosted…