Examine source code of Hetalia - Spain Theme

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#f7d9d9",
      "tab_background_text": "#732929"
    }
  },
  "version": "2.0",
  "name": "Hetalia - Spain Theme",
  "manifest_version": 2,
  "description": "APH Hetalia - Spain Theme.\nFor anyone enjoying HETALIA, anime. Here you have this Spain theme for Firefox Browser!"
}