Examine source code of Smartlink Extension

{
  "name": "Smartlink plugin",
  "description": "Quickly access your apps from your browser",
  "key": "MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAihELv7Tt5ShUIgQnukobn8ncN8JxJjNNScBJ5oJOlL7CvppbYfqLac2XbOkUWJeAohngk8dwmK+U4UoiaPAfW143vaD3Ti/dJUKJsjF0mjzZ5XVOAu0h8do9GZc1Vo6xokPEkJl6I2H6Y0DtLvx8NRw3S6TiixaMCWR2NQoFKgHUyxMiyHWdd83hiEKkk/1j34Xgwjx5YpEa50+69QxG5NVrPysFQOyp+EQUr1b1FbKpQA+9VD2wQxIUnOvR1e8dDqauQ9N2D6Fa/yGG76pqv0sd/9IeBoNjZUTkY97Ycxgjt88kbNGfaOqa2pecSk8SA82z2h/SErlmZDlvJBbetwIDAQAB",
  "version": "2.3.1",
  "manifest_version": 2,
  "browser_action": {
    "default_title": "Smartlink plugin",
    "default_popup": "index.html",
    "default_icon": "launchericon-48-48.png"
  },
  "permissions": [
    "activeTab",
    "storage",
    "contextMenus",
    "menus.overrideContext",
    "https://*/*",
    "file:///*/*",
    "http://localhost:3000/*",
    "webRequest",
    "windows",
    "<all_urls>"
  ],
  "content_security_policy": "script-src 'self'; object-src 'self'",
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "web_accessible_resources": [
    "launchericon-48-48.png",
    "SmartlinkLogo.svg",
    "SmartlinkLogoWithText.svg",
    "SmartlinkLogoInvert.svg"
  ],
  "externally_connectable": {
    "matches": [
      "<all_urls>"
    ]
  },
  "icons": {
    "48": "launchericon-48-48.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{85f2d9b5-ecd7-4710-8ad9-fc4cf09621d8}"
    }
  }
}