Examine source code of Kawaii Cat

{
  "theme": {
    "images": {
      "theme_frame": "Firefox.png"
    },
    "colors": {
      "frame": "#3281b3",
      "tab_background_text": "#0c3063"
    }
  },
  "version": "2.0",
  "name": "Kawaii Cat",
  "manifest_version": 2,
  "description": "The kawaii cat strikes again~"
}