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If you value privacy, ditch Chrome and switch to Firefox now
(www.fastcompany.com)
This is a most excellent place for technology news and articles.
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.