Unfortunately, Firefox seems to generally not like the idea that the Browser is used as an application platform. A way more fundamental API they refuse to impl

Unfortunately, Firefox seems to generally not like the idea that the Browser is used as an application platform. A way more fundamental API they refuse to implement is the file access api. Which lets you build web apps that can open and save local files. With this API, Chrome is now a great application platform for which you can write software that can be used just like desktop software.