Examine source code of Bazilla Firecat

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#607C9D",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Bazilla Firecat",
  "manifest_version": 2,
  "description": "Basically, I took my ginger cat called Basil and incorporated him into the Firefox logo. The result: Bazilla Firecat. This is my first design so I'm not sure if it'll be good or not... Enjoy!"
}