Hello Chrome Ext noob here. I tried everything to have Chrome send a message to a native messaging host, but failed miserably on both mac and windows. I tried running the ext below and I keep getting “Error when communicating with the native messaging host.”.

background.js

chrome.runtime.onMessage.addListener((message, sender, sendResponse) => {
  console.log("Entered addListener");
  if (message.action === 'fetchInfo') {
    chrome.runtime.sendNativeMessage('com.yourcompany.tf', message.data, response => {
      if (chrome.runtime.lastError) {
        console.log("Error communicating with native messaging host:", chrome.runtime.lastError.message);
        sendResponse({ error: chrome.runtime.lastError.message });
      } else {
        console.log("Response from native messaging host:", response);
        sendResponse(response);
      }
    });
    return true; // This keeps the message channel open for asynchronous response
  }
});

manifest.js

{
    "manifest_version": 3,
    "name": "WhoDidIt Extension",
    "version": "1.0",
    "permissions": ["activeTab", "scripting", "nativeMessaging"],
    "background": {
      "service_worker": "background.js"
    },
    "content_scripts": [
      {
        "matches": ["*://*.<deprecated>/tf/*/attributes"],
        "js": ["content.js"]
      }
    ],
    "icons": {
      "16": "icon16.png",
      "48": "icon48.png",
      "128": "icon128.png"
    },
    "web_accessible_resources": [{ 
      "resources": ["icon48.png"],
      "matches": ["https://*/*"]
    }]
  }

com.yourcompany.tf.json

{
  "name": "com.yourcompany.tf",
  "description": "WhoDidIt Extension Native Messaging Host",
  "path": "/opt/homebrew/bin/pwsh",
  "args": [
    "/Users/test/Downloads/TF/host.ps1"
  ],
  "type": "stdio",
  "allowed_origins": [
    "chrome-extension://<deprecated>/"
  ]
}

Tried registering the native messaging host on both mac (by putting it in the NativeMessaging folder) and windows (by adding a registry key as specified).