Examine source code of Weh Inspector

{
  "manifest_version": 2,
  "name": "Weh Inspector",
  "default_locale": "en_US",
  "version": "2.2resigned1",
  "version_name": "2.1",
  "author": "Michel Gutierrez",
  "description": "Trace remote procedure calls on Weh 2 addons",
  "background": {
    "scripts": [
      "background/main.js"
    ],
    "persistent": true
  },
  "icons": {
    "32": "content/images/icon-32.png",
    "40": "content/images/icon-40.png",
    "48": "content/images/icon-48.png",
    "128": "content/images/icon-128.png"
  },
  "options_ui": {
    "page": "content/settings.html?panel=settings",
    "open_in_tab": false
  },
  "permissions": [
    "tabs",
    "contextMenus",
    "management",
    "storage"
  ],
  "applications": {
    "gecko": {
      "id": "weh-inspector@downloadhelper.net"
    }
  }
}