Examine source code of Tabify

{
  "manifest_version": 2,
  "name": "Tabify",
  "description": "This extension allows you to use tabify.co web application integrated with your browser",
  "version": "1.0.9resigned1",
  "browser_action": {
    "default_icon": "icons/icon.png",
    "default_popup": "popup.html"
  },
  "icons": {
    "16": "icons/icon16.png",
    "36": "icons/icon36.png",
    "48": "icons/icon48.png",
    "72": "icons/icon72.png",
    "96": "icons/icon96.png",
    "120": "icons/icon120.png",
    "144": "icons/icon144.png",
    "192": "icons/icon192.png"
  },
  "content_scripts": [
    {
      "matches": [
        "http://tabify.co/*",
        "http://localhost:8087/*"
      ],
      "css": [],
      "js": [
        "injectScript.js"
      ]
    }
  ],
  "content_security_policy": "script-src 'self'; object-src 'self'",
  "permissions": [
    "activeTab",
    "tabs",
    "<all_urls>",
    "webRequest",
    "webRequestBlocking",
    "background",
    "storage",
    "system.display",
    "contextMenus"
  ],
  "background": {
    "page": "popup.html",
    "persistent": true
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{b8bcd075-2d93-47a7-be99-58d5b9c56266}"
    }
  }
}