Examine source code of PSAL extension

{
  "description": "PSAL extension",
  "manifest_version": 2,
  "name": "PSAL extension",
  "version": "1.0",
  "icons": {
    "48": "icons/pulse.png"
  },
  "applications": {
    "gecko": {
      "id": "MozillaUsers@pulsesecure.net",
      "strict_min_version": "52.0"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "https://*/*"
      ],
      "js": [
        "content-script.js"
      ]
    }
  ],
  "permissions": [
    "nativeMessaging",
    "tabs",
    "management"
  ]
}