Examine source code of PWC

{
  "name": "PWC",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "PWP.png"
    },
    "colors": {
      "frame": "rgba(117, 117, 117, 1)",
      "tab_background_text": "rgba(122, 122, 122, 1)",
      "toolbar": "rgba(92, 92, 92, 1)",
      "toolbar_field": "rgba(156, 156, 156, 1)",
      "toolbar_field_text": "rgba(107, 107, 107, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{cd7c7758-142d-4d6a-ae0d-85804e57e015}"
    }
  }
}