Detecting child windows of a browser window

[badreg]

Is it possible for a web app (presumably Javascript) to detect a list of child windows of the browser window that it is running on? I am using Firefox with no plugins. I want to create a child window of the browser window to monitor the app's activity, but I don't want the server to be able to detect this.

 

I am guessing that it is not possible to call something like

EnumChildWindows()

with browser Javascript, but if someone who is more knowledgeable can confirm this, I would greatly appreciate it. Thank you!

[ImAlsoRan]

There is a jQuery library called duplicate.js which you can find here. Once enabled, you can call

$(document).ready(function () {
	if (window.IsDuplicate()) {
    	console.log("I did a thing!");
	}
});

Let me know if that works for you!

 

Update: Here's a promising API that's native in JS: https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/API/windows/getAll

[badreg]

@ImAlsoRan Thank you for your reply! I think that you misunderstood my question (or more likely, I failed to state it clearly).

 

I am creating a window with my own application and making it a child of a Firefox window, like this:

CreateWindowEx(
                    WS_EX_TRANSPARENT | WS_EX_LAYERED, // extended window style
                    fooName, // registered class name
                    fooName, // and window title
                    WS_POPUP, // window style
                    CW_USEDEFAULT, // horizontal position of window
                    0, // vertical position of window
                    600, // window width
                    350, // window height
                    (HWND) hwndOfBrowserWindow, // handle to parent or owner window
                    NULL, // menu handle or child identifier
                    hInstance, // handle to application instance
                    this // sent with WM_CREATE message in CREATESTRUCT
                    );

This child window is not created by Firefox and is not itself a browser window. Can a web app detect that the browser window that it is running in has a child window attached to it through JavaScript (or other means) without escalated privileges?

[colonel_mortis]

No, a website can only know/find out about tabs/popups that it opened itself, so it has no way to detect windows that you created using the win32 API.

 

(This assumes that the site doesn't use flash or java applets, which have more privileges and may allow that, but I believe neither are supported in Firefox any more anyway.)