ReviewNB is very promising! I just wish it could live within Github (my idea is something like how Zenhub reorganizes issues into a Kanban board - add a tab that only allows viewing of ipynb files), since right now I have to kind of cajole people to review notebooks on their site.
Whenever I thought of integrating the review experience in the GitHub UI (via browser extension), I always thought of overwriting the GitHub diff UI. That approach is very hacky and would result in the extension stability issues (any DOM change in GitHub diff could break the extension).
But I just looked at Zenhub and having a separate tab for notebook review could actually work! Since it relies only on the tab related HTML, the extension would be relatively stable. There's still a question of how to post comments etc. But it might be a good start to just offer notebook diff in a separate GitHub tab for pull requests.
