Examine source code of Signer.Digital Digital Signature, PKI

{
  "name": "Signer.Digital Digital Signature, PKI",
  "description": "Digital Signature of eReturns, PDF & Web User Auth, RSA Encryption/Decryption, Certificate Enrollment/Download on Smartcard.",
  "author": "Chartered Information Systems Pvt. Ltd",
  "icons": {
    "32": "icon32.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "manifest_version": 3,
  "content_security_policy": {
    "extension_pages": "default-src 'none'; script-src-elem 'self'; style-src 'sha256-uLwQTV1tPwb9YVsJyNd7aW0N2K5Q81CuSbjDdsEm2lQ='"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "sd_firefox_extension@signer.digital"
    }
  },
  "content_scripts": [
    {
      "all_frames": true,
      "js": [
        "content.js"
      ],
      "matches": [
        "*://*/*",
        "file:///*"
      ],
      "run_at": "document_end"
    }
  ],
  "action": {
    "default_icon": "icon32.png",
    "default_popup": "popup.html"
  },
  "web_accessible_resources": [
    {
      "resources": [
        "icon32.png",
        "icon_trash.svg",
        "sdscript.js",
        "SdHtmlPage.html",
        "sdstyle.css"
      ],
      "matches": [
        "*://*/*",
        "file:///*"
      ]
    }
  ],
  "permissions": [
    "nativeMessaging"
  ],
  "version": "5.0.2"
}