With the recent update, the 'group tabs' feature was added. Myself and many other users discovered this when tabs become grouped when we don't want them to, and we need to deal with the visual clutter or right click and ungroup them. The frustrating thing comes from how easy it is to group tabs accidentally. Simply dragging and moving tabs around (which is a regular part of how I mentally organize what I'm doing) will often group tabs. Weirdly, you can grab a tab A, move it around tab B and it is possible to place tab B in a group by itself having done nothing except move around tab A with the mouse. The UI functionality of initiating the tab group still needs work. It's somewhat intuitive when you know about it and want it. I don't dislike the grouping feature, I dislike that it is unintentional 99% of the time and it is way too easy to do accidentally. This feature should NOT be enabled by default, and it should have a toggle in the settings to easily turn it off.