Ubuntu Snap update spoiled my World Cup Final
To the defence of Snap, I have the same issues on my Firefox installed with PPA(Firefox updates at random time, then kindly asks to reboot by replacing each webpage by a grey one with a restart button, and it doesn't restart tabs in private windows)It's a very Firefox problem, not snap(I use PPA and not Snap because snap outright doesn't work when your home isn't /home/uname , and mine is /home/company_domain/uname  )
(I can't believe that ubuntu forces you to use a software that isn't production ready)