What doesn't work in Firefox?

For my day to day use everything works fine. I don't remember anything that didn't except the vscode.dev thing that appeared in the front page yesterday. Apparently the local file access is not supported/enabled in Firefox yet.

And when I was messing with CSS a few months ago there was... background-blur? Or something like that, not supported in Firefox. But pretty minor things.

Don't remember anything else where I had to switch to chromium lately.