Examine source code of the wall is back

{
  "name": "the wall is back",
  "manifest_version": 2,
  "version": "10.0",
  "theme": {
    "images": {
      "theme_frame": "firefox 2.78.png"
    },
    "colors": {
      "frame": "rgba(3, 0, 0, 0.02)",
      "tab_background_text": "rgba(23, 73, 255, 1)",
      "toolbar": "rgba(5, 5, 5, 0)",
      "bookmark_text": "rgba(214, 0, 0, 1)",
      "toolbar_field": "rgba(0, 3, 3, 0.02)",
      "toolbar_field_text": "rgba(0, 0, 0, 1)",
      "tab_line": "rgba(3, 3, 3, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{f8680d45-a3bc-4b9d-a21e-220950aae4ca}"
    }
  }
}