Examine source code of Little Brown Bird

{
  "name": "Little Brown Bird",
  "manifest_version": 2,
  "version": "4.0",
  "theme": {
    "images": {
      "theme_frame": "LittleBrownBirdHCustom.jpg"
    },
    "colors": {
      "frame": "rgba(224, 223, 166, 1)",
      "tab_background_text": "rgba(56, 1, 1, 1)",
      "toolbar": "rgba(223, 224, 166, 0)",
      "bookmark_text": "rgba(56, 1, 1, 1)",
      "toolbar_field": "rgba(223, 224, 166, 0.08)",
      "toolbar_field_text": "rgba(56, 1, 1, 1)",
      "tab_line": "rgba(0, 0, 0, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{13c09ddd-9adb-435c-82d3-322bf5535e56}"
    }
  }
}