If I want to test my web app with say 4 different identities then figuring out which container is "free" becomes cumbersome.
https://developer.mozilla.org/en-US/Add-ons/WebExtensions/AP...
https://addons.mozilla.org/en-us/firefox/addon/containers-on...
If I want to test my web app with say 4 different identities then figuring out which container is "free" becomes cumbersome.