Examine source code of TpUpgrade

{
  "name": "TpUpgrade",
  "manifest_version": 2,
  "description": "Removes advertisements of chatroom websites made by Tarh-Pardaaz",
  "version": "0.1.0",
  "browser_action": {
    "default_icon": "icons/icon128.png",
    "default_title": "TpUpgrade",
    "default_popup": "popup.html"
  },
  "background": {
    "scripts": [
      "dist/storage.js",
      "dist/handlers.js",
      "dist/init.js"
    ],
    "persistent": true
  },
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "permissions": [
    "storage",
    "activeTab",
    "webNavigation",
    "<all_urls>"
  ]
}