Examine source code of Nature Earthy

{
  "manifest_version": 2,
  "name": "Nature Earthy",
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#1e3a14",
      "tab_background_text": "#e0f0c0",
      "toolbar": "#2a4e1c",
      "toolbar_text": "#cce8a0",
      "toolbar_field": "#345c22",
      "toolbar_field_text": "#eef8d8",
      "tab_line": "#7ec832"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{cd64bd17-072d-48e3-bf6c-f583ede84603}"
    }
  }
}