Examine source code of widow

{
  "name": "widow",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "widow.png"
    },
    "colors": {
      "frame": "rgba(229, 230, 232, 1)",
      "tab_background_text": "rgba(191, 0, 255, 1)",
      "toolbar": "rgba(0, 24, 179, 0.48)",
      "toolbar_field": "rgba(204, 204, 204, 0.56)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{9dbc4942-df96-4a02-88b6-905ffe1acbf4}"
    }
  }
}