Examine source code of firefox by glock

{
  "theme": {
    "images": {
      "theme_frame": "4.jpg"
    },
    "colors": {
      "frame": "#f0ec0c",
      "tab_background_text": "#ff9808"
    }
  },
  "version": "2.0",
  "name": "firefox by glock",
  "manifest_version": 2,
  "description": "fire fox made by me, glock"
}