Unfortunately, @firefox is not as well good as that awful browser, Chrome, not only missing functionality, but also as a user experience:

* Missing tabs groups, there is one experimental, but still waaaaaay behind a muture tabs in Chrome, like moving tabs group, sync these groups, moving tabs inside the group and so on.

* Sync tabs between devices! Good luck with that, in chrome it is so easy, in firefox, creating a rocket is easier.

* Page translation, what a joke!

* Pin tabs is buggy AF, it is normal thing for the firefox to pin a tab then restart to see that tab!

* Firefox documentation is awful, it seems outdated or just using a macOS layout, or just using something we don't know!

TL;DR: it is a browser that still lives in 2010 and need years to catch-up 

I'm totally disappointed 😞