Examine source code of Factory Days

{
  "name": "Factory Days",
  "manifest_version": 2,
  "version": "3.0",
  "theme": {
    "images": {
      "theme_frame": "factory-3.png"
    },
    "colors": {
      "frame": "rgba(229, 230, 232, 1)",
      "tab_background_text": "rgba(255, 255, 255, 1)",
      "toolbar": "rgba(171, 171, 171, 0.59)",
      "bookmark_text": "rgba(0, 0, 0, 1)",
      "toolbar_field": "rgba(172, 171, 171, 0.49)",
      "toolbar_field_text": "rgba(0, 0, 0, 1)",
      "tab_line": "rgba(12, 53, 110, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{f61a3a54-b46b-4f25-99ac-0af4701c1739}"
    }
  }
}