Examine source code of Ad Killer

{
  "manifest_version": 2,
  "name": "Ad Killer",
  "description": "A Basic program for blocking ads",
  "version": "0.9resigned1",
  "permissions": [
    "activeTab"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "run_at": "document_end",
      "js": [
        "jquery-3.2.1.min.js",
        "content.js"
      ]
    }
  ],
  "applications": {
    "gecko": {
      "id": "{99f660be-10c4-4cc8-9205-72dd45f156b9}"
    }
  },
  "browser_action": {
    "default_icon": "ad128.png",
    "default_title": "Ad Killer"
  }
}