Examine source code of Come Back Red Bird

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#4c8a39",
      "tab_background_text": "#f7ffba"
    }
  },
  "version": "2.0",
  "name": "Come Back Red Bird",
  "manifest_version": 2,
  "description": "Bright red bird, the sign of winter. Come back in my yard where I put the feeder. I knew I'd see you soon, the weather's getting colder. You're always welcome here, pretty red Cardinal."
}