Saw this on hacker news today: https://omar.website/tabfs/

It's for *nix and not Plan 9, but just glancing through the project
description it looks like it'll get you to something like webfs from abaco.

Didn't I see someone put "mozilla.tar" in their contrib directory a while
back? Well, I think that was a joke, but hey, maybe with 9p and VNC one
could control a Linux instance of Firefox by directly mounting its TabFS
filesystem!

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