Examine source code of The Marsh by M♥Donna

{
  "name": "The Marsh by M♥Donna",
  "manifest_version": 2,
  "version": "4.0",
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "rgba(209, 206, 193, 1)",
      "tab_background_text": "rgba(255, 250, 250, 1)",
      "toolbar": "rgba(209, 206, 193, 0)",
      "bookmark_text": "rgba(255, 255, 255, 1)",
      "toolbar_field": "rgba(209, 206, 193, 0.07)",
      "toolbar_field_text": "rgba(255, 255, 255, 1)",
      "tab_line": "rgba(255, 255, 255, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{a8b2a72c-4843-409d-924c-26c898b7fd88}"
    }
  }
}