Examine source code of Forest Walks

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Forest Walks",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgb(39, 64, 60)",
      "toolbar_text": "rgb(177, 203, 199)",
      "frame": "rgb(9, 36, 33)",
      "tab_background_text": "rgb(177, 203, 199)",
      "toolbar_field": "rgb(16, 42, 39)",
      "toolbar_field_text": "rgb(184, 222, 211)",
      "tab_line": "rgb(39, 64, 60)",
      "popup": "rgb(39, 64, 60)",
      "popup_text": "rgb(177, 203, 199)",
      "tab_loading": "rgb(39, 64, 60)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{597ace11-a15f-4cf1-ac7f-aab333f05b15}"
    }
  }
}