rsstodolist

That extension is a front-end for the RSS todo list application : https://rsstodolist.eu/ It allows you, by a single click, to add the URL of the webpage you're viewing to an RSS feed. Typical example is marking web pages to read later. Also, if you know the feed name of a friend of yours, you may also "push" links to it's RSS feed. That's another cool use case. Feeds are public so anyone can publish to any feeds. Be aware of that before using it for sensible URLs. But, instead of using the public server (rsstodolist.eu), you can also deploy the app on your own server (https://github.com/paulgreg/rsstodolist-node-server) and configure the extension to use that endpoint to have maximum privacy and security. Check https://rsstodolist.eu/ for further details. Application and extension are open source.