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Maybe (probably?), but back when I worked at Mozilla in ~2010 "Tree Style Tabs" was one of the most popular add-ons. Here's a screenshot of what the feature lo

• tapoxi 2y ago
  They unfortunately ruined TST with the switch to WebExtensions because it could no longer replace the top tab bar. There were hacks you could do by modifying something in your Firefox profile directory. Bizarre to me that they didn't take TST's popularity as a hint of supporting vertical tabs as a native feature until almost 7 years later.
  • knallfrosch 2y ago
    Compared to pushing and implementing CSS, JS and HTML standards, cryptography, APIs, mobile OS release cycles etc, I've always wondered whether vertical tabs would've been an easy win.
  • gkoberger 2y ago
    Yeah, I remember it being a huge internal argument against WebExtensions at the time. (But, security + easy of building + compatibility + speed of developing Firefox + a bunch of other things made the switch off XUL the right choice)
  • reginald78 2y ago
    I want to say they actually put some work in to allow TST to still work when they transitioned to quantum as it was a popular extension. I got the impression they were eventually going to add back in the horizontal tab bar disable as well but if that was even true they clearly forgot about it. I've been using the userChrome hacks for close to 7 years now.