Their browser needs to run on a single platform, their own platform, and only one rendering backend, etc. Thus it is a lot less complex than Chrome or Firefox.
read deep nutrition, i can summarize sinple.
eat all kinda meat, organ, muscle all of it, egg and milk also good.
plants have evolved to protect themselves using chemicals so they're bad.
seed oils are the root of all evil and illness.
good nutrition of ancestors means better looks for next generation.