Examine source code of Aero Steel

{
  "theme": {
    "images": {
      "theme_frame": "steelHeader.jpg"
    },
    "colors": {
      "frame": "#000000",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Aero Steel",
  "manifest_version": 2,
  "description": "Works best with the Strata Aero theme:\n<a rel=\"nofollow\" href=\"https://addons.mozilla.org/en-US/firefox/addon/7390\">https://addons.mozilla.org/en-US/firefox/addon/7390</a>"
}