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Tree Style Tabs were released for Firefox around 2007 https://piro.sakura.ne.jp/xul/_treestyletab.html.en#history https://piro.sakura.ne.jp/xul/_treestyletab.h

Tree Style Tabs were released for Firefox around 2007 https://piro.sakura.ne.jp/xul/_treestyletab.html.en#history https://piro.sakura.ne.jp/xul/_treestyletab.html.en#history I am not sure if someone like Opera was earlier, but Arc is likely copying this.

Lammy 3y ago
> I am not sure if someone like Opera was earlier OmniWeb 5.0, 2004: https://arstechnica.com/gadgets/2004/02/ow5/3/#tabs https://arstechnica.com/gadgets/2004/02/ow5/3/#tabs
- stonogo 3y ago
  Opera 4 had them in 2000. Opera 3 might have, but it won't run on Windows 10 so I can't easily check. edit: Started up a VM -- Opera 3 didnt have tabs at all, although it did already have an MDI.
  - fellowniusmonk 3y ago
    I used Opera over other browsers for a long time for performance reasons, it had M2, my favorite email client ever to this day, which got rid of traditional "folders", there's an alternate timeline somewhere where Opera won the browser wars and they already have flying cars and a federated web.
- cosmotic 3y ago
  Windows common controls had side-aligned tabs around 1997
  - pgeorgi 3y ago
    OS/2 2.1: https://guidebookgallery.org/screenshots/os221#general https://guidebookgallery.org/screenshots/os221#general, released December 1993.
- kitsunesoba 3y ago
  Yep, OmniWeb was the first place I saw the of the vertical tabs back in the mid-00s. Blew my mind. The concept of “drawers” that OS X had at the time was well suited for this kind of thing, with some “free” (in terms of dev effort) flexibility of allowing the user to choose which edge they unfurled from. It’s too bad they fell out of style in favor of much more static sidebars.