Examine source code of PAP

{
  "manifest_version": 2,
  "name": "Pap",
  "version": "1.0.1",
  "description": "Search engine that ends global warming",
  "icons": {
    "48": "icons/back50.png"
  },
  "background": {
    "scripts": [
      "./background-script/index.js"
    ],
    "persistent": false
  },
  "permissions": [
    "tabs",
    "http://*/*",
    "https://*/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "Content.js",
        "./content_scripts/pap.js"
      ]
    }
  ],
  "browser_action": {
    "default_icon": "icons/back50.png",
    "default_title": "Start a journey with us",
    "default_popup": "popup/index.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{dff81133-bf0f-4887-a400-be2ff172accb}"
    }
  }
}