Examine source code of Lambda

{
  "theme": {
    "images": {
      "theme_frame": "Firefox-Custom.png"
    },
    "colors": {
      "frame": "#c9c9c9",
      "tab_background_text": "#262626"
    }
  },
  "version": "2.0",
  "name": "Lambda",
  "manifest_version": 2,
  "description": "Lambda is the greek symbol for balance and equality. It's a long time symbol of the gay community and an apt symbol for sustainability."
}