access Websocket traffic from chrome extension

Question

There is a page (game), which communicate via WebSocket to the server. I can see the data (frames) in the Chrome Developer Tool. Is it possible to access / modify this communica

Answer 1

Seems like the bug is fixed and available. In the manifest.json you need to explicitly specify the permissions

{
    ...
    "permissions": ["webRequest", "ws://*/*", "wss://*/*"]
    ...
}

and in the network filters it should be specified as a websocket request.

const networkFilters = {
    urls: [
        "wss://echo.websocket.org/*"
    ]
};
chrome.webRequest.onBeforeRequest.addListener((details) => {
    const { tabId, requestId } = details;
    // do stuff here
}, networkFilters);