Examine source code of JavaScript Switcher

{
  "name": "Javascript Switcher",
  "author": "Suraj Jain",
  "version": "1.4.0",
  "background": {
    "scripts": [
      "/background/background.js"
    ]
  },
  "description": "Add a button in the url bar to block or enable javascript per-site.\n",
  "homepage_url": "https://github.com/meetDeveloper/Quick-JS-Switcher",
  "icons": {
    "128": "/icons/js.png"
  },
  "manifest_version": 2,
  "page_action": {
    "browser_style": true,
    "default_icon": "/icons/js_disabled.png",
    "default_title": "Enable Javascript"
  },
  "permissions": [
    "<all_urls>",
    "webRequest",
    "webRequestBlocking",
    "storage",
    "tabs"
  ]
}