Examine source code of Johans-firefox

{
  "theme": {
    "images": {
      "theme_frame": "Untitled-1copy.jpg"
    },
    "colors": {
      "frame": "#000000",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Johans-firefox",
  "manifest_version": 2,
  "description": "just something I made for myself.. since it doesn't work proper if you want a local Persona, I'm gonna do it this way"
}