Examine source code of herdmates v2

{
  "theme": {
    "images": {
      "theme_frame": "herd_of_horses_in_sunrise.jpg"
    },
    "colors": {
      "frame": "#c1d9d3",
      "tab_background_text": "#0d0909"
    }
  },
  "version": "2.0",
  "name": "herdmates v2",
  "manifest_version": 2,
  "description": "A herd of horses in the sunset."
}