Tabs, we all use them, and we hate it when they get too small to read or you have too many of them open at the same time. While browsers like Chrome can group tabs together in a neat little stack with colour codes, the problem is you must expand them again to see what is in a group, in case you forget which tabs you grouped together or sent one tab into the wrong group.
Vivaldi has a rather simple solution to the problem, something no one has thought up in all these years of browser design. Add a second bar, below the main bar. Shocking! I know, with the latest update Vivaldi simply adds a new bar right below the main one that allows you to continue your tab stacking escapades with the bonus of everything being visible at a glance.
This is conjunction with other tab specific features the browser already has like Compact Tab Stacking that reduces the amount of space an open tab takes on the main bar, so you can still see what you have open in the main tab bar without it looking like a string of squished squares. There are also options for Tab Tiling, Vertical Tabs, Auto Stacking and many more that truly do make it a lot easier to manage your browser real estate.