I see why the extension isn't working (IF the theory below is correct).
The extension correctly tells Chrome that it is a flash file that can be opened by Adobe Flash Player, but according to various sites in t'internet; the newest flash player doesn't always automatically register on Chrome and/or doesn't have the "Always allowed to run" checkbox ticked. To solve this:
Type in your address bar:
chrome://plugins
Make sure it looks something like this:
Make sure the checkbox "Always allowed to run" is ticked and ensure that the "MIME types:" you see there are correct. If they're not correct, the extension I linked earlier might solve that for you. If somehow you still cannot get this to work (Flash player isn't in that list or what have you), try re-installing flash for Chrome.
Please let me know if this worked!