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Mozilla released a Firefox Nightly test build with vertical tabs - gHacks Tech News
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From Wikipedia, the free encyclopedia
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
Try out Tree Style Tabs for an hour. I'm curious how you'll feel about it.
I've been using TST for years and while it can be a bit buggy at times I couldn't imagine going back to the default tab system.
This is my main, but I struggle to find a good CSS theme that integrates with this instead of Sidebery.