[ydant]

This is one of those really simple ideas that's really exciting - making me think of a lot of "what-ifs". Thank you for sharing.

I'd love for this level of functionality - but auto-sync to Google Sheets (my platform of choice for "more than a few rows that I might need to share") (or like I mentioned elsewhere, maybe Braintool, for further manipulation/browsing in Emacs/org-mode).

Maps support would be really cool to see the results in tabular form as well as where they are.

I also noticed it doesn't notice if you add the same site twice - so instead of editing an existing entry, it lets you create a second one (maybe both options are needed).

A browser extension has some key advantages - getting around some security issues like you mentioned, but you can also make the icon for the extension reflect when you've already stored data for a URL (Braintool, which I mentioned elsewhere, does this).