> notice they have a dom.webgpu.blocked-domains with the sole entries being "easyeda.com,*.easyeda.com", I wonder what that's about?

I found this issue: https://bugzilla.mozilla.org/show_bug.cgi?id=1980392 and commit: https://phabricator.services.mozilla.com/D262053

It looks like per-domain WebGPU blocking was added exclusively just for easyeda.com !

Haven't read it all, but the story seems to be that EasyEDA's WebGPU usage was broken because it relies on some aspects which Firefox hasn't implemented yet. So they made this blocklist to get Firefox to behave as if it lacked WebGPU support completely on this domain, which makes EasyEDA fallback to some other non-broken version. Maybe they couldn't get in touch with EasyEDA directly, since it seems far easier to have them just disable WebGPU for some known versions of Firefox.