A:
No, the internet browser cannot replace the one on you computer. Some websites will not open properly if they require updates done to the adobe flash player which allows to you to view specific content like videos or games. check the link below for further information.
https://us.en.kb.sony.com/app/answers/detail/a_id/35328/p/47329,70712,70715,90749/c/65,66/kw/browser