Side question: I've been trying to switch to firefox as my main browser but one thing is holding me up. When I'm using a private window, cookies are not shared between private tabs. I can see the advantage to that behavior, but is there a way to share them so that I can be logged into the same site in multiple private tabs? Unironically, I haven't had any luck googling this problem.

If you open a new tab from an existing tab, your session persists across tabs. So, for example, middle clicking on the Hacker News logo will preserve your HN session across tabs.

Huh, this is how I expected it to work and it does work for hacker news but it doesn't work for one site I want it to work for. I'll have to dig deeper, thanks.

You can make as many separate containers as you like, where each tab shares the cookies with all the other tabs in that container. For example, I have a Facebook container that only shares with Messenger and none of the other tabs. I can see it works because sites that are logged in on one container are not logged in on others. It's easy to right-click and reopen a tab in one of your other containers.

Same. It works great and uses less RAM than Chrome.