Examine source code of Fill

{
  "manifest_version": 2,
  "name": "Fill",
  "version": "2.2.2resigned1",
  "description": "Removing auto button",
  "icons": {
    "48": "icons/icon.png"
  },
  "permissions": [
    "activeTab",
    "storage"
  ],
  "browser_action": {
    "default_icon": "icons/icon.png",
    "default_title": "Fill Form",
    "default_popup": "popup/index.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{69b7bf7e-64f5-4791-ae80-aba8b54a9644}"
    }
  }
}