Examine source code of Forest Dark

{
  "manifest_version": 2,
  "name": "Forest Dark",
  "version": "1.0",
  "theme": {
    "colors": {
      "frame": "#0b1d13",
      "toolbar": "#123524",
      "tab_background_text": "#bbf7d0",
      "toolbar_text": "#ecfdf5",
      "bookmark_text": "#4ade80"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{1a54e365-0338-44fa-999c-b2d361d585ac}"
    }
  }
}