Hm just saw this. I think if something can be done as an extension then there is no need to do it as a fork of the existing software. Are there any difference

Hm just saw this. I think if something can be done as an extension then there is no need to do it as a fork of the existing software. Are there any differences b/w nanobrowser and brwoserOS? like some functionalities that only browserOS could do and not nanobrowser which are worth mentioning?