This pain in the butt started a couple of weeks ago and today the pop up popped up on websites so I decided to turn off the MIDI in my browser settings and all is well again.

Strange all these years I never saw it it until now, anyway normal service is back.
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Dr Who rest in peace 1963-2017.
To borrow Davros saying...I NAME YOU CHIBNALL THE DESTROYER OF DR WHO YOU KILLED IT!