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Firefox Sidebar and Vertical tabs: try them out in Nightly Firefox Labs 131
(blog.nightly.mozilla.org)
A place to discuss the news and latest developments on the open-source browser Firefox
Sidebar makes my Firefox pretty slow at startup and has a few bugs. I would love a native alternative with similar features. Namely I would really like vertical tabs that aren't a sidebar because I want to be able to use sidebars without hiding my tabs... But seems like this new implementation is also a sidebar.