For now. Like I said, they're gauging interest in it for now, and it's currently basically a prototype. So kinda ironically, to support free knowledge, we've gotta inconvene (the proper verb is apparently "inconvenience"? sorry that's just too weird) and grovel to Google a bit. Someone can probably write a bs marketing passage about Google's auspices to supplant free knowledge through providing accessibility to a supernation of usuremongers.
Firefox conversion by-hand doesn't seem like it'll be that hard either, thanks to Manifest v3, which removed the stupid deviation from the standard of Chrome using callbacks instead of promises like everyone else does.