More details about that on their github page [1]. It seems you basically need to include a JS file from [their CDN](//cdn.jsdelivr.net/npm/eruda).
As someone who fondly remembers the early Firebug days, it is great to see this. It is very frustrating to me that tablets and phones are so powerful, but we can't do even basic dev stuff on them.
Unfortunately javascript URIs don’t work from the address bar in many browsers like mobile Safari, probably to prevent attacks. At least for safari you need to create a bookmarklet with that content and execute it by “visiting” the bookmark.
As someone who fondly remembers the early Firebug days, it is great to see this. It is very frustrating to me that tablets and phones are so powerful, but we can't do even basic dev stuff on them.
[1] https://github.com/liriliri/eruda