To use Tab Groups, make sure you are running Firefox version 137 or higher. To check, click the hamburger icon at the upper right, select Help and then click About Firefox. The latest version ...

Firefox version 136.0 introduced vertical tabs ... Have you given a vertical tab layout a try before? If you haven't, it's a new take on the traditional tab formats that browsers use.

Another change is a refreshed New Tab layout (image below), as well as improvements to the browser's pop-up blocker as they should no longer be as overly aggressive. Firefox now supports touchpad ...