I unfortunately don't believe this feature will be implemented anytime soon. This is because this idea has been popular on the previous community feedback system. And I don't think Mozilla has the will to develop this instead of following just the tr...
Just a reminder to the people here the idea seems to still be in Exploring More phase of the idea. So Mozilla / Firefox team is indeed still looking into the idea. However, I want to let the devs know that Firefox View is not the ideal solution nor a...
I'd like to point out to FF devs reading this that I would love vertical tabs on both sides, what really needs to happen is that the tab bar can be hidden / shelf behavior.
Here's an idea, let's pop-up a new "welcome to Firefox" window to show popular extensions to the new user. And put up the greats like privacy badger and uBlock Origin to be a one click install.
It's not a major showstopper for my organization. But I will say that it is pushing back a more mass deployment of Firefox. I'm eagerly waiting for the approval and deployment of this feature.