Examine source code of Black Blue

{
  "name": "Black Blue",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "i1_2.jpg"
    },
    "colors": {
      "frame": "rgba(0, 0, 0, 1)",
      "tab_background_text": "rgba(0, 157, 255, 1)",
      "toolbar": "rgba(0, 0, 0, 1)",
      "bookmark_text": "rgba(18, 88, 186, 1)",
      "toolbar_field": "rgba(5, 37, 82, 1)",
      "toolbar_field_text": "rgba(142, 185, 245, 1)",
      "tab_line": "rgba(23, 152, 232, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{f16fc94c-826d-4b09-a5eb-c978a9f567dc}"
    }
  }
}