Examine source code of Content Switcher

{
  "background": {
    "scripts": [
      "lib/js/lodash.min.js",
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": "icon32.png",
    "default_popup": "popup.html",
    "default_title": "Content Switcher"
  },
  "description": "Redirect Content like JS, CSS, HTML, JSON based on Regex Rules. Develop local, see result on Server without uploading every time.",
  "devtools_page": "devtools.html",
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "applications": {
    "gecko": {
      "id": "oitio2004@gmail.com",
      "strict_min_version": "53.0"
    }
  },
  "manifest_version": 2,
  "name": "Content Switcher",
  "options_ui": {
    "page": "options.html"
  },
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "<all_urls>",
    "storage",
    "alarms",
    "tabs",
    "notifications",
    "contextMenus",
    "*://*/*",
    "downloads"
  ],
  "version": "0.5.4resigned1"
}