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I said browsers not extensions.Yes, there are Firefox-based browsers that offer native vertical tabs and bookmarks. One popular example is the "Tree Style Tab" extension for Firefox, which allows you to have vertical tabs in Firefox. Additionally, some Firefox forks or alternative browsers like Waterfox and Pale Moon also offer built-in support for vertical tabs and bookmarks.
I apologize for the confusion. As of my knowledge, there aren't any Firefox-based browsers that have native support for vertical tabs and bookmarks without the need for extensions. In that case, using browser extensions like Tree Style Tab is likely the best way to achieve vertical tabs in Firefox-based browsers.I said browsers not extensions.
I didn't find in watefox, in pale moon I supposed the same
Article: Mozilla could add support for Vertical Tabs in Firefox - gHacks Tech NewsUsers had voted to request Vertical Tabs for Firefox at the Mozilla Crowdicity community. The feedback portal, which was slow to pick up the pace, is abuzz with activity. A Product Community Manager at Mozilla, has finally responded to the request with good news. He wrote that since the request has emerged as a top idea in the community, it has been reviewed by the developers at Mozilla. They are looking at ways to improve the tab management, and are researching the possibility of adding support for Vertical Tabs in Firefox. This of course does not mean that the feature is certain to be added, which is why I wrote "could" instead of "will".