Examine source code of Blue-free

{
  "name": "Blue-free",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "111.jpg"
    },
    "colors": {
      "frame": "rgba(0, 103, 120, 1)",
      "tab_background_text": "rgba(24, 156, 180, 1)",
      "toolbar": "rgba(0, 147, 171, 1)",
      "bookmark_text": "rgba(198, 250, 255, 1)",
      "toolbar_field": "rgba(0, 103, 120, 1)",
      "toolbar_field_text": "rgba(198, 250, 255, 1)",
      "tab_line": "rgba(255, 209, 36, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{9d7d5ec1-0075-429c-a953-8946124554d3}"
    }
  }
}