Examine source code of ChargeGuardian

{
  "manifest_version": 2,
  "name": "ChargeGuardian",
  "version": "2.8.2",
  "description": "Stop surprise charges & hidden subscriptions. Works on Firefox.",
  "homepage_url": "https://chargeguardian.io",
  "browser_specific_settings": {
    "gecko": {
      "id": "chargeguardian@taylorwellness.io",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": [],
        "description": "ChargeGuardian does not collect any data. All user preferences are stored locally in the browser. No data is transmitted to external servers."
      }
    }
  },
  "permissions": [
    "storage",
    "tabs",
    "alarms",
    "notifications",
    "contextMenus",
    "scripting"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_popup": "popup/popup.html",
    "default_icon": {
      "16": "icons/icon16.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "developer": {
    "name": "ChargeGuardian Team",
    "url": "https://chargeguardian.io"
  },
  "web_accessible_resources": [
    "overlay/*",
    "icons/*"
  ]
}