browser extension

It's an extension:

Each Container stores cookies separately, so you can log into the same site with different accounts and online trackers can’t easily connect the browsing.

A great idea for a feature if you ask me. For example, I have two Buffer accounts and my solution is to use different browsers entirely to stay logged into both of them. I know plenty of folks that prefer the browser version of apps like Notion, Front, and Twitter, and it's cool to have a way to log into the same site with multiple accounts if you need to — and without weird trickery.

This is browsers competing on UI/UX features rather than web platform features, which is a good thing. Relevant: Opera Neon and Refresh.

Varun Vachhar:

A Chrome extension for debugging SVG paths by converting them to outlines and displaying anchors, control points, handles and arc ellipses.

An amazing contribution to this open source project would be to make all those points draggable, and then be able to spit out the newly adjusted code.

Also, weren't browser extensions on their way to being interoperable? Looks like the community group has significant work done.