Current version of JetStream 2 can't completely run on browsers that are not implementing WebAssembly. That's the case for 32-bits ports we have on WebKit.
Created attachment 412338 [details] Patch
<rdar://problem/70695561>
Committed r269028: <https://trac.webkit.org/changeset/269028> All reviewed patches have been landed. Closing bug and clearing flags on attachment 412338 [details].