There are still a few things that aren't quite right - not having an official API means you have to guess a lot. Details are in the code but the most prominent one is the rotation of the heading arrow targets that move to the next pano. It's incorrect in a number of places and after having tried a number of different things, I am declaring defeat - let me know if you have figured it out already.

You can explore different locations by entering the lat/long as part of the URL, clicking on the Random / My location buttons or clicking on the arrows in each scene to move. You can also try dragging a Google Maps Street View URL from a different browser onto the main window - this doesn't always work since the regex to extract the location from isn't perfect. Finally, you can click on the Street View button to open the "real" Street View. I considered adding a selection map from a different provider like Leaflet but I don't think that's allowed by Google's terms of service.

You can hide this panel by clicking the gear icon top right or by appending &cs=1 to the URL.

I am very grateful to the authors who generously shared their code here and here and made it far easier for me to make this. Comments, feedback and of course fixes for my doubtless many mistakes are very welcome - contact details are  here