Examine source code of Cute Animals

{
  "theme": {
    "images": {
      "theme_frame": "firefox.png"
    },
    "colors": {
      "frame": "#000000",
      "tab_background_text": "#c800ff"
    }
  },
  "version": "2.0",
  "name": "Cute Animals",
  "manifest_version": 2,
  "description": "Lots of CUTE Animals on white with a pink to white gradient to the left! I'm sure lots of people will love this and the pretty and cute pictures!"
}