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How to exit Kiosk Mode in Edge programmatically

I'm developing a system that runs in Edge (school's default browser), the browser launches in Kiosk mode from a desktop shortcut
"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --kiosk www.program-name.com --edge-kiosk-type=fullscreen
On the landing page, I can exit the program no problem with a close button using
<input type="button" onClick="window.close();" value="Close">
Once you proceed into the program, next page onwards, window.close no longer works. The only way to quit is by using Alt + F4 or pressing the Start key and right clicking the Edge icon

If you open the Developer Tools console, you'll find this message when the window doesn't close by window.close():
Scripts may close only the windows that were opened by them.
The message is clear. There're some restrictions when using window.close() to close window. In Chromium, window.close() succeeds if the new window/tab has an opener or if the back/forward stack contains fewer than two entries. The limitation of window.close() is for security and user-experience. For more detailed information, you can refer to this blog.
The only way to close the proceed window programmatically is opening the window by window.open(). For example, if you want to open a new window by clicking a link, you can use the code like below:
link
Then on test.html you can use window.close() to close the window.

Google Chrome closes when I open a new tab using my browser action Javascript, no idea why

I'm in the process of writing a Google Chrome extension, and I'm hung up on what should be a very simple task. I have a browser action that opens a popup, "popup.html", which then loads a small Javascript file, "popup.js". As soon as I get the DOMContentLoaded signal from the popup page, my Javascript opens a new tab with a certain URL. This behavioral quirk is by design - in some cases it will display a menu, and in other cases it will just open this URL.
I currently have some very simple code which is supposed to do this, but whenever it opens this tab, Chrome suddenly closes. I'm using a Mac (OS X Mavericks), so it doesn't crash entirely (still running), the window just closes. When I open it up again, the tab it was supposed to open is there, but the "popup.html" menu is awkwardly hanging over the UI still and won't go away.
Here is my complete popup.js file:
function stuff() {
window.open("http://stackoverflow.com/");
}
document.addEventListener('DOMContentLoaded', stuff);
I'm guessing that I may need to gracefully close my popup window before going to this link or something, but that seems like I'm overthinking it. After all, I've seen other extensions that have normal links in their browser action popups, and you can click those to open new tabs without any Javascript magic.
I've also tried using the chrome.tabs.create function, yet the same thing happens. The Chrome developer console doesn't show any errors. Thoughts?
Edit1: Just disabled all extensions and tried again. Still breaking. Going to boot up my Windows 8 box and see what happens on it.
Edit2: Works with a short delay before opening the window now on Mac, see my answer below.

Ok, I think I may have figured this out, but it's still weird. I did this on my Windows 8 PC, and the browser didn't crash, but the browser action popup didn't close the way it's supposed to either.
On a hunch, I altered my code on the Mac to give the browser some time to render the popup window:
function stuff() {
window.open("http://stackoverflow.com/");
}
setTimeout(stuff, 500);
Worked without a problem on the Mac this time. I'm guessing it's an issue with the browser being interrupted while rendering the popup window, but it's still weird. I would still appreciate an explanation from someone who actually knows what's going on here! :-)

javascript : window.open

I am working in vb.net 2005. I am in a position to start a new browser with process.start().
Now I have to open that browser in a specific size(say height:300 width:500)
Process.Start("firefox.exe", "abc.html")
and I have written this following code on load of abc.html
var myRef = window.open('abc.html','','left=20,top=20,width=300,height=500');
but it does not resize.
If I add 1 button on this page and click on it (by writing same code on its click event), a new window with expected size opens.
Am I going wrong somewhere?
Thanx.

Firefox doesn't let pages resize the window by default. Also note, if you already have Firefox running then browser preferences will dictate whether you get a new window or a tab. You can force a separate instance of Firefox by using the -no-remote command line flag, but then you won't be able to use the default profile (only one Firefox instance per profile).
My questions for you are:
Why are you launching Firefox from another executable at all instead of just having users click on a link and have it open in their default browser?
If you do need to launch Firefox from an executable, why spend all this effort overriding the user's preferences and settings?
If you' re launching from an executable and are keen to annoy your users whatever the cost, why not just find and resize the Firefox window using the normal Windows APIs?

JavaScript close window for external URL

In my page when I click on a link a popup will be opened. In that popup, I have the close button. To close the window I am using simple JavaScript function as window.close().
This is working fine.
Now when I copy the URL of the popup link and open it in new window, I am not able to close the window.
In Firefox when using Firebug the warning given is:
'Scripts may not close windows that were not opened by script.'
Please help me out on any other alternative.

Firefox seems to answer that question: 'Scripts may not close windows that were not opened by script.'
This is a security measure. Imagine every site could close every other page you have open, that wouldn't work very well would it?
That's why only a parent window may close its children windows.

There may be a setting Firefox that allows windows not opened by script to be closed by script, but even if there is, what chance is there that your visitors will all have enabled this setting?
You can't work around this problem, it is how Firefox (and certainly other browsers) works. The only answer is to change your approach.
Why are you using windows as popups anyway? This has not been recommended for some time now and is mostly frowned upon. Popups that are actual windows may be blocked by popup-blockers.
You should probably use a modal popup instead of a window

Mozilla notification showing browser on click

I'm trying to make Mozilla FireFox plugin showing notification. Notifications are visible for Windows and even Mac I want the user to click the notification and open the web page, it sounds pretty simple.
But when adding observer and making window.open or gBroswer.addTab window is opened and tab is opened but in case FireFox is minimized when the notification is shown windows are opened in background and not visible to the user.
Tried to use Components.interfaces.nsIAlertsService and chrome://global/content/alerts/alert.xul they work the same from this perspective.
Is there a way to tell the browser to be top most and be visible to the user?

It doesn't look like this can be done. Firefox generally only supports switching focus between different browser windows when one of them is already focused (via window.focus()). To handle notifications the way you want it (and the way Thunderbird does it) one would need to call SetForegroundWindow() on Windows - there are only two occasions in the Firefox code where this function is called. One is when a new Firefox process is started, the other is when one Firefox window is being minimized. Unfortunately, in this case neither can really be used and Thunderbird indeed uses custom code rather than existing XPCOM APIs to bring itself into foreground.