Examine source code of AutoCropLite

{
  "manifest_version": 2,
  "name": "AutoCropLite",
  "version": "1.0",
  "description": "Suggest crop region based on contrast.",
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "default_title": "AutoCropLite",
    "default_popup": "popup.html"
  },
  "icons": {
    "48": "icons/icon48.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "autocroplite@example.com",
      "strict_min_version": "58.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}