Pageswiper by bclindner

Pageswiper is an extension that passively scrapes metadata from the sites you visit. You can then view the data (in JSON format) from the extension's icon.

Optionally, it can send all the data it scrapes from each page to an HTTP webhook of your choosing, along with the URL and retrieval date. This can be good for collecting data if you're doing research, or if you're just curious about the metadata you might be missing while you browse.