For privacy, I use first-party isolation. The effect is that all domains get their own container. In day-to-day use I haven't seen any sites that don't work with it enabled.
I use Temporary Containers all day. Love this addon. This is fantastic not only for privacy/security for everyday use but also great for testing sites while doing development. It becomes really easy to be logged into all the different types of users in a website at the same time and see the interaction.
Agreed. I have mine in automatic mode. My default browsing experience is that most pages have never seen my computer before (at least as far as cookies go), and don't get to set anything that will stick around, unless I manually add them to a named container.
I tried this for awhile. It completely breaks some sites, like Jira iirc. It was completely unusable on my work PC. And broke stuff randomly on my home PC. The biggest problem is that you can't easily add a whitelist to fix it. At least you couldn't back when it first came out.
Are you referring to the multi-container extension? With first-party isolation there's no visual indication of containers. It seems to work on mobile for me (FF Android 68.4.1).
https://www.ctrl.blog/entry/firefox-fpi.html