Not sure if this is well known, but press period `.` when viewing a PR, repo, or file and github will send you to a in-browser visual code editor. Able to make commits in there too, perfect for [nit] comments
Link for people who didn’t know about this feature: https://mobile.twitter.com/github/status/1425505817827151872 and the official documentation with other keyboard shortcuts: https://docs.github.com/en/get-started/using-github/keyboard...