I haven't used it outside of Windows Firefox and Android but it works great for me as well.
For mobile specifically: Rarely do I have any issues, and when I do, I have a quick panel button for Bitwarden (top drag down menu) that lets me manually trigger it. I can't think of any apps that it doesn't work with. My one nit is that autofill credit card info doesn't work often, but obv that's a secondary use, and the info is still with me if I ever need it on the go. And adding new login info can be a little tedious on mobile -- much easier to create it first, then autofill. Highly appreciate the 2FA feature too. The auto copy feature feels really seamless regardless of if I'm on my phone or not.
I'd be curious what issues you seem to be running into with it.
Doubtful. The main reason I could see a 3D printer starting a fire is either thermal runaway, often caused by bad software (on cheap printers) or electrical issues. You can check your wiring and make sure that nothing looks loose and all of your cables are in good condition. You can also make sure that your printer firmware is up to date. It's a Prusa right? I think you should be safe from software failure in that case, as they're quality.
If you're really concerned about it, you can also move your power supply, and even your mainboard, outside of the enclosure by using longer cables. This would keep the majority of the electrical components away from the foam and heated box. From my position I don't see an issue, but that's my personal opinion -- not legally accountable information. I will say that Stefan on CNC Kitchen uses foam as well, to get rid of ringing in prints. If you decide to go through with it, just use common sense and check to see if anything is hot. You might also get some benefit out of looking into silent stepper motors/drivers and trying to make the printer itself quieter.