need a chrome extension editor / developer

I have a Chrome Extension but not sure if all Features work fine, Need someone who could check the Code, edit the design (Images/design are mine) you only have to implement them.
Add some Buttons and Features.
One of that Features is that you Need a key to run the Extension monthly, and a Generator for those keys would be nice. The code generator should be implementable in emails or websites.

Make me a offer per pm please !!!