Examine source code of Blue IceWeasel

{
  "theme": {
    "images": {
      "theme_frame": "header-weasel.jpg"
    },
    "colors": {
      "frame": "#267cab",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Blue IceWeasel",
  "manifest_version": 2,
  "description": "A lot of Firefox personas and so few for IceWeasel... I wanted to add one !\nBlue Fox Persona gave me the color idea and <a href=\"https://outgoing.prod.mozaws.net/v1/a642027a0ac2a3ce60cc437dd757949daf5821aa493278c099ed50f446d7f2f1/https%3A//wiki.ubuntu.com/IceWeaselIcon/\" rel=\"nofollow\">https://wiki.ubuntu.com/IceWeaselIcon/</a> gave me the icon"
}