Examine source code of Neurai Sign

{
  "manifest_version": 3,
  "name": "Neurai Sign",
  "version": "0.12.6",
  "description": "Use Neurai's blockchain (XNA) to authenticate yourself using coins or tokens through digital signatures.",
  "short_name": "Neurai Sign",
  "permissions": [
    "storage"
  ],
  "optional_host_permissions": [
    "https://*/*",
    "http://localhost/*",
    "http://127.0.0.1/*"
  ],
  "host_permissions": [
    "https://rpc-depin.neurai.org/*",
    "https://rpc-testnet.neurai.org/*"
  ],
  "action": {
    "default_popup": "popup/popup.html",
    "default_icon": {
      "16": "icons/icon16.png",
      "32": "icons/icon32.png",
      "48": "icons/icon48.png",
      "64": "icons/icon64.png",
      "128": "icons/icon128.png"
    }
  },
  "background": {
    "page": "background/background.html"
  },
  "content_scripts": [
    {
      "matches": [
        "https://*/*",
        "http://localhost/*",
        "http://127.0.0.1/*"
      ],
      "js": [
        "content/content.js"
      ],
      "run_at": "document_end"
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "content/inject.js"
      ],
      "matches": [
        "https://*/*",
        "http://localhost/*",
        "http://127.0.0.1/*"
      ]
    }
  ],
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "64": "icons/icon64.png",
    "128": "icons/icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "neurai-sign@neuraiproject.org",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  }
}