Panorama View the best replacement for the retired "Tab Groups" feature on Firefox, which is the best tab management system ever. It's a part of my daily workflow. So far I rate 4 stars just for the effort and continuing this priceless add-on on Firefox Quantum, however there are two essential features from the old "Tab Groups" that are still lacking:

* search mechanism to bring forward tabs on Panorama View.
* context menu to move tabs between groups without opening Panorama View.