Yes but it doesn't work the same, you don't know what it is going to do until it does it. Try it on Chrome. It's a way more polished UI that gives you a dynamic preview. Makes a big difference especially on multiple monitors.

As for the other things (MIDI etc), is there any confusion?

As far as midi goes, that seems like a feature that is not implemented which is different from not working. That's like saying PDF isn't working in Chrome...

Some google products have a worse experience with FF. Some websites straight up tell you to use chrome instead.

Not saying it's right, just saying there's certainly a tradeoff.

Firefox has made claims before about changes that specifically affect firefox performance: https://www.techradar.com/sg/news/mozilla-claims-google-has-...