Examine source code of Extension Manager Pro

{
  "manifest_version": 2,
  "name": "Extension Manager",
  "description": "Manage Extensions, Enable/disable, Custom Folder or Nickname, Star and Download as CRX or ZIP.",
  "version": "2.7.0.0",
  "default_locale": "en",
  "browser_action": {
    "default_title": "Extension Manager",
    "default_popup": "popup/index.html",
    "default_icon": {
      "16": "icon/logo.png",
      "32": "icon/logo.png",
      "48": "icon/logo.png",
      "128": "icon/logo.png",
      "300": "icon/logo.png"
    }
  },
  "web_accessible_resources": [
    "assets/*",
    "icon/logo.png",
    "popup/index.html"
  ],
  "icons": {
    "16": "icon/logo.png",
    "32": "icon/logo.png",
    "48": "icon/logo.png",
    "128": "icon/logo.png",
    "300": "icon/logo.png"
  },
  "permissions": [
    "management",
    "storage",
    "unlimitedStorage",
    "downloads",
    "*://clients2.google.com/service/update2/crx*",
    "*://clients2.googleusercontent.com/crx/download/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{00ea91a0-47a0-44d9-b475-a94686102507}"
    }
  }
}