Examine source code of Greenfire Backyard

{
  "name": "Greenfire Backyard",
  "manifest_version": 2,
  "version": "3.0",
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#ffffff",
      "tab_background_text": "#ffffff",
      "toolbar_field_text": "rgba(10, 1, 1, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{ffd554c2-9faf-4fd6-8ec0-bb268d8eff3f}"
    }
  }
}