Examine source code of Doculife

{
  "manifest_version": 2,
  "name": "Doculife",
  "version": "1.4.1",
  "author": "Doculife",
  "description": "Extend Doculife functionality to the browser",
  "-ms-preload": {
    "backgroundScript": "backgroundScriptsAPIBridge.js",
    "contentScript": "contentScriptsAPIBridge.js"
  },
  "icons": {
    "16": "icon-16.png",
    "32": "icon-32.png",
    "48": "icon-48.png",
    "64": "icon-64.png",
    "128": "icon-128.png"
  },
  "browser_action": {
    "default_icon": {
      "16": "icon-16.png",
      "32": "icon-32.png",
      "48": "icon-48.png",
      "64": "icon-64.png",
      "128": "icon-128.png"
    },
    "default_popup": "popup.html",
    "default_title": "Doculife"
  },
  "permissions": [
    "activeTab",
    "contextMenus",
    "storage",
    "notifications",
    "https://*.mydoculife.com/*",
    "https://mydoculife.com/*"
  ],
  "background": {
    "scripts": [
      "browser-polyfill.js",
      "background.js"
    ],
    "persistent": false
  },
  "content_scripts": [
    {
      "matches": [
        "https://mydoculife.com/*",
        "https://dev.mydoculife.com/*"
      ],
      "js": [
        "contentScriptsAPIBridge.js",
        "browser-polyfill.js",
        "content.js"
      ],
      "all_frames": true
    }
  ]
}