Examine source code of Tron-ish

{
  "theme": {
    "images": {
      "theme_frame": "Tron-ish4.jpg"
    },
    "colors": {
      "frame": "#000000",
      "tab_background_text": "#00fbff"
    }
  },
  "version": "2.0",
  "name": "Tron-ish",
  "manifest_version": 2,
  "description": "Adds a little Tron: Legacy lightcyle to the top of your Firefox browser. Colors are pretty much only black and light blue, following the typical style of Disney's new film. I do not claim to own rights to Tron: Legacy, as I only took an existing picture and modified it. Enjoy!"
}