> this browser does not have SharedArrayBuffer support enabled

It was disabled for Spectre safety reasons, but it can be re-enabled by navigating to "about:config", searching for "javascript.options.shared_memory" and toggling it to enabled. (But it was obviously disabled for good reason, so might want to enable it temporarily)

Thanks! That fixed that problem. Except now I get "this browser does not support passive wasm memory". There aren't any obvious javascript.options.* options for that.

Oh dear sorry about this, it's a little too non-obvious how to see the demo! I've [pushed a small commit](https://github.com/rustwasm/wasm-bindgen/commit/f016ae5846bf...) to update the demo to include information about browser requirements. Today this demo requires Firefox Nightly (64) and requires the `javascript.options.shared_memory` feature to be enabled. Other browsers will likely soon be able to run the demo as well!

Thanks, I'll give that a go!

Not experimental, you need to enable SharedArrayBuffer in config because it's unsafe (Meltdown/Spectre) as of now, fixes are being worked on.

How are you finding Blazor in general? Is it worth looking into for smaller web apps or is it still far from production readiness?

It's definitely worth looking into. Although the authors of the library keep reminding the reader that blazor is not production ready I have found that it does everything I need it to. I found that it either works or doesn't at all if there is an unhandled exception in your code to you try to do something that is not supported. However, I haven't found the behavior to be non-deterministic (by that I mean flaky). I guess they may want to change the API before release. What is amazing is the ability to reference .net standard libraries.