You say it: It's all about the user experience. And neither Electron nor a chrome extension can provide a seamless look and feel. Interestingly, Firefox extensi

You say it: It's all about the user experience. And neither Electron nor a chrome extension can provide a seamless look and feel. Interestingly, Firefox extensions with XUL used to be able to feel "native". For instance, there was FireFTP, an XUL application within Firefox (basically acting as an application within the original Mozilla "meta" application). That felt native. Have you ever touched Qt? It provides a way more native feeling then wxWidgets did. You see, I probably come from another time, you maybe never heard of XUL, but it was a great technology at that time. Maybe similar as how Swing changed Java GUIs in the early 2000s (but inverse, by going from native to custom widgets). Really, I would say even more today, it's all about the quality of the widgets, the smoothness of the UI and the interplay with the native ecosystem. You won't get anywhere with browser extensions in this respect.