Examine source code of Forest ------ black

{
  "theme": {
    "images": {
      "theme_frame": "f.png"
    },
    "colors": {
      "frame": "#bfe0c0",
      "tab_background_text": "#89d99a"
    }
  },
  "version": "2.0",
  "name": "Forest    ------ black",
  "manifest_version": 2,
  "description": "-"
}