Examine source code of Colour Change

{
  "theme": {
    "images": {
      "theme_frame": "Firefoxskin-1.jpg"
    },
    "colors": {
      "frame": "#ff0000",
      "tab_background_text": "#fa0a0a"
    }
  },
  "version": "2.0",
  "name": "Colour Change",
  "manifest_version": 2,
  "description": "The color keeps changing on till all the colours in the world are used. But only five a shown here!"
}