Examine source code of M&M Shoes

{
  "theme": {
    "images": {
      "theme_frame": "shoesfirefox2.jpg"
    },
    "colors": {
      "frame": "#757575",
      "tab_background_text": "#40e32d"
    }
  },
  "version": "2.0",
  "name": "M&M Shoes",
  "manifest_version": 2,
  "description": "This was created for a 1680x1050 display and quickly cropped and edited for larger displays. I will later release an updated version that is fixed for larger displays."
}