Examine source code of apples undercover

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#40434a",
      "tab_background_text": "#edece8"
    }
  },
  "version": "2.0",
  "name": "apples undercover",
  "manifest_version": 2,
  "description": "my very own apple tree and early snow in autumn"
}