Examine source code of Mountains

{
  "name": "Mountains and Lakes",
  "manifest_version": 2,
  "version": "4.0",
  "theme": {
    "images": {
      "theme_frame": "MountainsH1.jpg"
    },
    "colors": {
      "frame": "rgba(98, 144, 181, 1)",
      "tab_background_text": "rgba(255, 255, 255, 1)",
      "toolbar": "rgba(100, 145, 184, 0)",
      "bookmark_text": "rgba(255, 255, 255, 1)",
      "toolbar_field": "rgba(100, 145, 184, 0.03)",
      "toolbar_field_text": "rgba(255, 255, 255, 1)",
      "tab_line": "rgba(255, 255, 255, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{ecd94568-3447-464c-ba55-35f51122a736}"
    }
  }
}