Making a thread-safe GC perform as well as today's highly-optimized single-threaded GCs is hard.
That is entirely a problem of your own making. You decided to bet hard on single threaded dynamic Javascript being a suitable model for all end user software. It turns out it isn't, but it's too late now.
This kind of thing is exactly why Javascript isn't a good choice as a general purpose VM platform. Which you are presumably aware of because you aren't writing the next generation of Firefox in Javascript, you are creating Rust. But apparently what isn't good enough for Mozilla is good enough for everybody else…
Which brings us to the real problem with the web - everybody except the browser vendors is a second class citizen.
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That is entirely a problem of your own making. You decided to bet hard on single threaded dynamic Javascript being a suitable model for all end user software. It turns out it isn't, but it's too late now.
This kind of thing is exactly why Javascript isn't a good choice as a general purpose VM platform. Which you are presumably aware of because you aren't writing the next generation of Firefox in Javascript, you are creating Rust. But apparently what isn't good enough for Mozilla is good enough for everybody else…
Which brings us to the real problem with the web - everybody except the browser vendors is a second class citizen.