@jsparknz @simon @Vivaldi I did some testing and found that you can disable it in Vivaldi by turning off the Google Meet support in Vivaldi's Privacy and Security settings.
https://notes.kvibber.com/@kelson/statuses/01J2CQHARWXZ957D8RJ2Z4NNRH
Mine was already turned off, but I don't know what the default is, since I installed it so long ago and don't remember what settings I changed at the time.
@kelson @jsparknz @simon @Vivaldi oh noooo! This has to go. I really don't want to switch back to Firefox from Vivaldi again.