I'd like to see that too, but even with Sidebery I have been using Safari more because of its tab groups (and I have found the extensions lacking). It seems Moz

I'd like to see that too, but even with Sidebery I have been using Safari more because of its tab groups (and I have found the extensions lacking). It seems Mozilla is not interested in that idea any more. Without tab groups, its a stark difference that feels like the olden days when you had IE (no tabs) and FF (tabs). You just can't go back if they are useful to you.