Examine source code of SignWell for QuickBooks

{
  "manifest_version": 3,
  "name": "SignWell for QuickBooks",
  "version": "1.0.4",
  "description": "QuickBooks Online integration with SignWell for eSignatures",
  "permissions": [
    "storage",
    "tabs"
  ],
  "action": {
    "default_icon": {
      "128": "icons/icon128.png"
    },
    "default_title": "SignWell for QuickBooks"
  },
  "icons": {
    "128": "icons/icon128.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "type": "module"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.qbo.intuit.com/*"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "tooltip.css",
        "signing-prompt.css"
      ],
      "run_at": "document_idle"
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "*.css",
        "*.png",
        "assets/fonts/*.otf",
        "assets/fonts/*.ttf"
      ],
      "matches": [
        "*://*.qbo.intuit.com/*"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "signwell-qbo@signwell.com",
      "strict_min_version": "100.0"
    }
  }
}