Why cant some users access my game using Chrome?

Myself and a tester are both using Google Chrome to run our game. On the tester’s version everything runs smoothly but with my version I cant get past the ‘install Unity Plugin’ prompt.(Even though I already have the plugin) We are both running the game from the same server location using Windows 7 so I can’t understand why our experiences should be any different. Any ideas?
For both of us, the Firefox version works as expected.

Probably your game is hosted in a secured context server (link starts with “https://”). Since Unity default script references links in a non-secured context (“http://”), this cause a “non-secure content access through a secure host”.

I don’t know why, but in some cases Chrome simply blocks any content that falls on this situation.