It’s time to stabilize our relationship with Google setting an API key for go2streetview plugin as from Terms of Service:
The Google Maps API key allows to control Streetview service quota usage. The new plugin release allows to specify the Google Maps API key in the licence dialog window:
A new key can be obtained going to the Google Maps APIs or clicking on “Get a new Google Maps API key” hyperlink in the licence text window.
clicking on Get a Key and specifying a new project
you will finally obtain a API key:
copy the API key text and paste it back into the plugin licence window: