The Firefox UI is now built with Web Components - Brian GrinsteadA couple of weeks ago, we landed a commit that took years of effort at Mozilla. It removed “XBL”, which means we’ve completed the process of migrating the Firefox UI to Web Components. It wasn’t easy - but I’ll get to that later. The Firefox UI can be thought of as a very large single page app. It was built with DOM and JS from the start, which was a bold technology choice for a native application
