In case you, too, have been bitten by the "no JS alert() in PWA" bug in #Vivaldi which renders a few #PWA's partially broken, it's a relatively recent bug by which I mean it's 2 years old
TBF: I haven't paid a dime for Vivaldi, they don't owe me anything, and it's a fine piece of tech. I can still be annoyed by bugs, though.
