Examine source code of The Bee Theme

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "rgba(229,230,232,1)",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "The Bee Theme",
  "manifest_version": 2,
  "description": "This theme gives your Firefox an all new look for all you bee-lovers out there -- and others. Give your browser a hint of nature, and remind you of happy summer days outside. Enjoy!"
}