Anyone can build a custom extension to do anything an extension is allowed to do. I had ~7 standard extensions that I pretty much always install into chrome browser. Over the past month or so I've been using Claude code to build a single custom extension that handles all of the things I used 7 extensions for previously. One extension does everything. You can even use the existing extensions you already use as guides for Claude to make sure all of the features you want are included. One extension to rule them all!