Amusingly, I found it in the comments of a less-capable extension, which people were griping was obfuscated. This extension is totally open. 👍
Example workflow: open #Firefox. New tab is already in a temporary container that'll be thrown away when I close it. I can open new tabs anytime, each one is in its own temporary container.
Type "cybre" into a tab and pick https://cybre.space/ from the awesomebar. I've configured a Cyberspace container, so it flips right over to that one where I'm already logged-in.
Click a GitHub link here, it opens in a temporary container. Make a GitHub container, log in. Now all GitHub links open in that container.
@zigg omg I'm installing the heck out of this. I tried using the semi-official containers extension for a while but it was buggy and kept randomly losing settings, and ever since I've resorted to manually turning cookie settings on/off, which is downright painful
@zigg depending on the usecase "Cookie AutoDelete" might be a good alternative: https://addons.mozilla.org/en-US/firefox/addon/cookie-autodelete/