You’re right, I can confirm the feature does indeed work on Firefox by changing the useragent string. However, this introduces other issues such as input devices not being detected which makes normal use of Meet difficult. For now, there seems to be nothing else to do other than waiting for Google to enable this on Firefox.
My bank also does this shit. It’s aggravating to use their website when every step along the way they put the burden of security on the user.
Pasting is disabled on almost every text field, even for things like account numbers (which they make you type in twice) when you want to do a transfer. The only way to log in is to manually type in your username, password, and a damn captcha everytime. The 6 digit 2FA code is the icing on the cake. If you idle for a minute or two, they log you out and force you to go through the whole thing again.