zlacker

Seems quite similar to Zen's experience, except it seems to be missing folders (which I admittedly don't use often, but they're sometimes handy to group a Jira ticket with a PR, or similar). I'll probably still stick with Zen while it's around, and maybe I'll hop over to LibreWolf as I'm not too happy about Mozilla's recent stance on privacy.

>>chryso+(OP)
Is it similar to tab groups? It's available on Firefox Nightly, don't know about stable.

>>Futuri+A
Maybe! Folders in Zen let you group, label and collapse tabs, so if that's the same thing then yes.