The only time I see websites break on Firefox is due to Firefox blocking their tracking script and somehow the website doesn’t work because of it. In those case, it’s not the browser’s fault that the website doesn’t work without the tracking scripts.
Other people mentioned Google Meet doesn’t support background blur in Firefox. Firefox is actually capable to do that in the past few months, but you’ll need to spoof your user agent to chrome, so it’s not Firefox fault.
The only time I see websites break on Firefox is due to Firefox blocking their tracking script and somehow the website doesn’t work because of it. In those case, it’s not the browser’s fault that the website doesn’t work without the tracking scripts.
Other people mentioned Google Meet doesn’t support background blur in Firefox. Firefox is actually capable to do that in the past few months, but you’ll need to spoof your user agent to chrome, so it’s not Firefox fault.