Is it basically "an IDE for playing with API's"?
Is it only for HTTP-based API's?
Does it come with canned functionality for popular services out there?
I read this but still don't feel like I fully understand what it does https://www.postman.com/api-platform/api-client/
EDIT: This blog post https://schier.co/blog/call-for-beta-testers made it click a little better: "...app that makes testing REST APIs super easy"
Personal feelings aside, snap is working fine. It's maybe a bit slow on startup, but that's it.
On top of that, Canonical is pushing snap very hard. Try to uninstall the Firefox snap - e.g. because it doesn’t integrate well with password managers - and install it using apt from the Mozilla repo. Ubuntu will later just silently replace it back with the snap version.
I’m about to switch away from Ubuntu as a result of this.