Examine source code of Lemons

{
  "theme": {
    "images": {
      "theme_frame": "lemons.jpg"
    },
    "colors": {
      "frame": "#f2ff00",
      "tab_background_text": "#fffd6b"
    }
  },
  "version": "2.0",
  "name": "Lemons",
  "manifest_version": 2,
  "description": "Lemons for my firefox"
}