You mean the thing that Opera had in the 90s, and Vivaldi since inception?
Linux
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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
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Top right of my tab bar in firefox, there is a little down pointing arrow. I click that: BOOM vertical tabs. Now make it an optional fixed thingie and let me stack them. I may be missing something here, but that sounds like something an experience Firefox dev can implement in half an hour.
It's better to integrate Tree Style Tab addon instead. It's not a good idea to re-implement a function which already has a great implementation...