On the topic of IPFS, but also slightly tangential -- how has nobody written an Activity Pub client/server in Javascript and distributed it as a Browser Addon?

On the topic of IPFS, but also slightly tangential -- how has nobody written an Activity Pub client/server in Javascript and distributed it as a Browser Addon? If an IPFS node/server can be literally hosted via a Firefox Extension[1], how has nobody done the same for an arguably easier protocol like Activity Pub? 1: https://github.com/ipfs/js-ipfs https://github.com/ipfs/js-ipfs