My colleagues started using https://github1s.com to browse our company's code on Github. It pops a "visual studio" window for the code. Looks great and useful.
But... I don't know much about web stuff. How can I tell if this is safe? What can the site see of my code? How is authentication dealt with? All I could find is that it is a different site entirely, not associated with Github.
Are there steps I can take to make sure it doesn't get a copy of the code I get from Github? And to make sure it couldn't in the future? How about checking it's not performing repository actions as myself?
What I'm after is how I would go about determining the safety of this site. What do I look for? What are the appropriate approaches they should have used?