Examine source code of JavaScript-Java Bridge

{
  "manifest_version": 2,
  "name": "JavaScript-Java Bridge",
  "short_name": "JSJBridge",
  "version": "1.82",
  "description": "A replacement for the Java Plugin so Java Applets without graphics continue to work on browsers that no longer support NPAPI plugins. Java's LiveConnect API is emulated — data & method calls can be exchanged, and Java can manipulate the webpage DOM.",
  "icons": {
    "48": "jsjbridge-icon.svg",
    "96": "jsjbridge-icon.svg"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "jsjbridge@advancedcontrols.com.au",
      "strict_min_version": "58.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "all_frames": true,
      "run_at": "document_start",
      "js": [
        "content.js"
      ]
    }
  ],
  "web_accessible_resources": [
    "jsjbridge.js"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "options_ui": {
    "page": "options.html",
    "browser_style": true,
    "chrome_style": true
  },
  "permissions": [
    "nativeMessaging",
    "storage"
  ],
  "optional_permissions": [
    "<all_urls>"
  ]
}