Examine source code of Minecraft mine

{
  "name": "Minecraft mine",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "mine.png"
    },
    "colors": {
      "frame": "rgba(235, 235, 235, 1)",
      "tab_background_text": "rgba(230, 255, 0, 1)",
      "toolbar": "rgba(255, 255, 255, 1)",
      "bookmark_text": "rgba(230, 255, 0, 1)",
      "toolbar_field": "rgba(204, 204, 204, 1)",
      "toolbar_field_text": "rgba(230, 255, 0, 1)",
      "tab_line": "rgba(230, 255, 0, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{d2c4139c-f79c-4ea4-8df8-9abdb4836f90}"
    }
  }
}