Examine source code of Dark Angels

{
  "name": "Dark Angels",
  "manifest_version": 2,
  "version": "2.0",
  "theme": {
    "images": {
      "theme_frame": "DA.png"
    },
    "colors": {
      "frame": "rgba(0, 64, 31, 1)",
      "tab_background_text": "rgba(219, 219, 175, 1)",
      "toolbar": "rgba(219, 219, 175, 1)",
      "bookmark_text": "rgba(255, 255, 255, 1)",
      "toolbar_field": "rgba(255, 255, 255, 1)",
      "toolbar_field_text": "rgba(0, 0, 0, 1)",
      "tab_line": "rgba(219, 219, 175, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{0e13b8ab-d09a-4dd9-8459-35eff6cd0054}"
    }
  }
}