How to prevent the client from using Chrome Extension the Interceptor websocket of my web page

I have a website websocket. Someone used Chrome Extension to steal my websocket data. The data itself does not have sensitive information,The backend is also verified so there is no threat

I know that I can monitor any changes in the DOM or enable devtool, but Chrome Extension can still steal my websocket content.

Is there any way to stop it?

Chrome Extension code like this

chrome.debugger.attach({ tabId: tabId }, "1.2", function () {
        chrome.debugger.sendCommand({ tabId: tabId }, "Network.enable");
        chrome.debugger.onEvent.addListener(onTabDebuggerEvent);
    }); 

function onTabDebuggerEvent(debuggeeId, message, params) {
    var debugeeTabId = debuggeeId.tabId;

    chrome.tabs.get(debugeeTabId, function (targetTab) {
        var tabUrl = targetTab.url;

        if (message == "Network.webSocketFrameSent") {

        }
        else if (message == "Network.webSocketFrameReceived") {
            var payloadData = params.response.payloadData;

            var request = {
                source: tabUrl,
                payload: params.response.payloadData
            };

            websocket.send(JSON.stringify(request));
        }
    });
}