Examine source code of Firefox is Golden

{
  "theme": {
    "images": {
      "theme_frame": "firefoxpersona1.png"
    },
    "colors": {
      "frame": "#ffc800",
      "tab_background_text": "#ff4400"
    }
  },
  "version": "2.0",
  "name": "Firefox is Golden",
  "manifest_version": 2,
  "description": "A little, fun Persona I whipped up in about 10 minutes. Enjoy my golden fox!\n\nIgnore the strip of orange on the bottom of the preview I'm under. It's not there when you put it on."
}