Examine source code of Dealhack

{
  "name": "Dealhack",
  "version": "2.0.14",
  "manifest_version": 2,
  "description": "Automatically uncovers promo codes as you shop online.",
  "homepage_url": "https://dealhack.com/",
  "author": "dealhack.com",
  "icons": {
    "128": "favicon-black.png"
  },
  "permissions": [
    "tabs",
    "webNavigation",
    "storage",
    "unlimitedStorage",
    "<all_urls>",
    "alarms"
  ],
  "browser_action": {
    "default_icon": {
      "20": "favicon-black-DM.png",
      "48": "favicon-black-DM.png"
    },
    "default_title": "Dealhack"
  },
  "background": {
    "scripts": [
      "bg/bundle.js"
    ],
    "persistent": true
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content/bundle.js"
      ],
      "run_at": "document_end",
      "all_frames": false
    }
  ],
  "web_accessible_resources": [
    "content/*.css",
    "content/*.svg",
    "*.css"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "Dealhack@dealhack.com"
    }
  }
}