Yes, Pads are like the group or tab, and sites the individual asset.
Right now when you hit new pad, it just fires a window prompt which may get blocked lol - need to swap this out for in-app dialog windows, I will do this ASAP so others don't get blocked as well, thank you.
(Edit: oh, you mean you thought to add a new site it was "new pad", got it - maybe I can make this more clear, again thank you for such great feedback here)
I edited my description comment a bit, but yes you are basically correct, a visual bookmarks manager that can be utilized cross-browser and device without an account, and where you can quickly check and interact with multiple sites that may or may not relate to each other. Also, I want to add more devtool-like features such as maybe exposing the page console, load times, different viewport sizes, etc.
The long-term goal is a launcher of sorts with a built-in browsing experience. A browser wrapped in a browser where you can "install" webapps. Iframes aren't gonna cut it, though...