I’m glad that it’s coming natively, but hands down there’s a whole lot of progress they have yet to make to come close to the usability provided by Sidebery, good that they’re also working on native vertical tabs in fact! So I think that if you’re looking for a better system you could try out that extension https://addons.mozilla.org/en-US/firefox/addon/sidebery/
You were far ahead of professors that make you write it out with pen and paper