Examine source code of Reading Goal Tracker

{
  "manifest_version": 2,
  "name": "Reading Goal Tracker",
  "version": "1.0",
  "description": "Track children's reading progress.",
  "permissions": [
    "storage"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icon.png"
  },
  "icons": {
    "48": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{242ac96a-ee45-4940-9330-d2a2d7162bd0}"
    }
  }
}