Yet another reason that js is Bad.
I suppose the issue here is that it’s not a problem that affects just firefox.
AFAIK it affects all browsers from WHATWG’s members, but in slightly different ways, depending on implementation details.
Firefox was just the one I thought was more interested in protecting users. But I was wrong, they prefer to build safety ports that everyone can admire without giving a shit about the missing walls in their house.
Anyway, I know JS pretty well as my daily job is mostly developing web applications with it (and looking for workarounds to weird bugs in JS frameworks).
WebAssembly can make it even worse.
But this are browser problems: had they used Rust instead of JS it would have been exactly the same.