HTML version recently get 403 Forbidden in Firefox's context menu search. It appears to be caused by Firefox adds a 'Origin: null' header in the request. Hope they can solve this bug one day.
Racket can also be used in terminal. But I think it's harder to debug in terminal compared to debug in DrRacket especially in the later chapter. Besides, racket also has a sicp package for the book(https://docs.racket-lang.org/sicp-manual).