Wow! This is the first I heard of this so I looked it up.
According to this article it looks like you need a particular build thats not in the nightly mainline, and its very experimental.
Still, its exciting to see them work on this! I use Tree Style Tabs with custom userchrome.css, but it is a bit fragile. Native vertical tabs would be great!
First time I hear about it too. I prefer usual horizontal tabs but I have several coworkers that use tree style tabs or similar as well. More customization/choice is usually good :)
i agree, i love to see it (i still use tree style tabs/sidebery but i would love to have it built in - especially the ability to hide the top tab strip)
It's probably feeding the page or selection context into, if their other behavior is any indicator, ChatGPT on your behalf. (And when Mozilla tried to push that on developers, they hated it.)
I've looked through the Mozilla blog post about the sidebar, but for some reason they don't mention it, including when people ask.
Mozilla has been obsessed with AI. Between all their investments and their purchase of a trend-chasing AdTech company, FakeSpot.
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