Examine source code of whatsapp-paster

{
  "manifest_version": 2,
  "name": "whatsapp-paster",
  "version": "1.1",
  "description": "Fix paste in WhatsApp Web",
  "author": "jcondor",
  "homepage_url": "https://github.com/jcondor98/whatsapp-paster",
  "content_scripts": [
    {
      "matches": [
        "*://web.whatsapp.com/*"
      ],
      "js": [
        "whatsapp-paster.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{03c84d10-5486-420f-815f-da9f502a3708}"
    }
  }
}