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Firefox Sidebar Addon like Brave or Vivaldi?
(feddit.de)
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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.
Community icon by Alpár-Etele Méder, licensed under CC BY 3.0
I use Tree Style Tab for the sidebar and Simple Tab Groups to get workspaces. They work quite well together. Customize userChrome.css to get rid of the sidebar header and other things and you get something like
I'm very non-adept with CSS. Any chance you could share the code you use to remove the header? Thanks either way!
Never mind, someone else linked something that worked for me.