Examine source code of Form Filler

{
  "manifest_version": 2,
  "name": "Form Filler",
  "version": "1.2.3",
  "description": "An easy to use extension that saves and fills forms.",
  "permissions": [
    "storage",
    "activeTab",
    "tabs",
    "downloads"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/icon16.png",
      "32": "icons/icon32.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "web_accessible_resources": [
    "privacy.html"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{bc4c83cb-7cb5-44d5-8d0f-7c803209b61a}",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}