Examine source code of Erra Band

{
  "name": "Erra Band",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "erratheme2.png"
    },
    "colors": {
      "frame": "rgba(27, 27, 27, 1)",
      "tab_background_text": "rgba(255, 255, 255, 1)",
      "toolbar": "rgba(28, 28, 28, 0)",
      "bookmark_text": "rgba(186, 186, 186, 1)",
      "toolbar_field": "rgba(69, 69, 69, 1)",
      "toolbar_field_text": "rgba(255, 255, 255, 1)",
      "tab_line": "rgba(255, 255, 255, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{6611ff5e-901a-4853-8f16-fe9fd55807b6}"
    }
  }
}