

In Firefox, I don’t remember having something similar. That was like 5+ years ago, I believe profiles were there, but perhaps less easy to use.
The profiles feature in Firefox haa been there for a long, long time—more than a decade, and possibly longer than Chrome has existed—but not many people read the documentation to find the command-line switch to evoke the selector, and they’ve never been terribly easy to find from inside the GUI.
I’ve encountered a couple of people who use them as remote cameras to observe their 3D printers. That suggests a bunch of other possibilities for things you want to be able to watch or listen to without standing over them and without buying an extra webcam to cover what might be a temporary need.