It's not super tricky to just make tabs flow vertically. This can bee done pretty easily
But behavior is where things start to fall apart. For starters, tabs can't be dragged to reorder them (well they can, it just doesn't work). And you can't do any kind of tree like layout so it's just a flat vertical list.
If Vertical tabs is your thing, extensions just do it much better.
Oh shit, where did u find that photo? Could I see the CSS so I could try to figure it out?
Pushing the limits of the Firefox Browser through the use of CSS.
#join #firefoxcss:mozilla.org
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