Sorry, I think people may be referring to the way that tabs appear more like buttons on the tab bar instead of looking like the tab part of a file folder.

There probably are extensions that let you tab switch with thumbnails, but I don't have any particular recommendations. Extensions would not be able to add that as a tab "hover" behavior, they would have to make it a button or menu action, or trigger it from the page content area.

If anybody could suggest an extension that puts a Mac-style Expose spread of tab panes on-screen, or even just drop-down thumbnail panes showing tab contents, I'd be grateful. This is just such a simple need! It always dazzles me how techno-minds love complex problems, and making complex solutions ("Pocket", "Flow" etc. etc.), but see right through the basics, year after decade...