Examine source code of DownloadStudio

{
  "author": "Conceiva",
  "background": {
    "scripts": [
      "bg.js"
    ],
    "persistent": true
  },
  "browser_action": {
    "default_title": "__MSG_extName__",
    "default_icon": {
      "16": "icon-16x16.png"
    },
    "default_popup": "popup.html"
  },
  "content_security_policy": "script-src 'self'; object-src 'self'",
  "default_locale": "en",
  "description": "__MSG_extDesc__",
  "icons": {
    "16": "icon-16x16.png",
    "32": "icon-32x32.png",
    "48": "icon-48x48.png",
    "128": "icon-128x128.png"
  },
  "manifest_version": 2,
  "name": "__MSG_extName__",
  "options_page": "options.html",
  "permissions": [
    "nativeMessaging",
    "cookies",
    "contextMenus",
    "downloads",
    "storage",
    "webRequest",
    "webRequestBlocking",
    "http://*/*",
    "https://*/*",
    "tabs"
  ],
  "version": "4.0.4resigned1",
  "applications": {
    "gecko": {
      "id": "downloadstudio@conceiva.com"
    }
  },
  "-ms-preload": {
    "backgroundScript": "backgroundScriptsAPIBridge.js",
    "contentScript": "contentScriptsAPIBridge.js"
  }
}