Examine source code of Thief Matthew

{
  "theme": {
    "images": {
      "theme_frame": "MatthewFirefoxbanner2.jpg"
    },
    "colors": {
      "frame": "#999999",
      "tab_background_text": "#1c1c1c"
    }
  },
  "version": "2.0",
  "name": "Thief Matthew",
  "manifest_version": 2,
  "description": "My drawings of Matthew from Fire Emblem 7."
}