chrome-target.js

// Enable target discovery
await Target.setDiscoverTargets({
    discover: true
});
// The following function is invoked anytime a tab is created.
Target.targetCreated((params) => {
    // If the target is not a page, return
    if (params.targetInfo.type !== 'page') {
        return;
    }

    // Extract the ID of the new Tab from event params.
    const { targetId } = params.targetInfo;
    // search for the desired tab in list of all tabs.
    const findTarget = (targets) => {
        return targets.find(target => target.id === targetId);
    };
    // Connect to the newly opened tab
    CDP({ target: findTarget }, async popup => {
        // Set download behavior
        popup.Page.setDownloadBehavior({
            behavior: 'allow',
            downloadPath: '/path/to/download'
        });
        // Monitor requests
        popup.Network.requestWillBeSent((params) => {
            console.log("PPP:", params.request.url);
        });
        await popup.Page.enable();
        await popup.Network.enable();
    });
});