window.close and self.close do not close the window in Chrome

Question

Ordinary javascript cannot close windows willy-nilly. This is a security feature, introduced a while ago, to stop various malicious exploits and annoyances.

From the latest working spec for window.close():

The close() method on Window objects should, if all the following conditions are met, close the browsing context A:

• The corresponding browsing context A is script-closable.
• The browsing context of the incumbent script is familiar with the browsing context A.
• The browsing context of the incumbent script is allowed to navigate the browsing context A.

A browsing context is script-closable if it is an auxiliary browsing context that was created by a script (as opposed to by an action of the user), or if it is a browsing context whose session history contains only one Document.

This means, with one small exception, javascript must not be allowed to close a window that was not opened by that same javascript.

Chrome allows that exception -- which it doesn't apply to userscripts -- however Firefox does not. The Firefox implementation flat out states:

This method is only allowed to be called for windows that were opened by a script using the window.open method.

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If you try to use window.close from a Greasemonkey / Tampermonkey / userscript you will get:
Firefox: The error message, "Scripts may not close windows that were not opened by script."
Chrome: just silently fails.

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The long-term solution:

The best way to deal with this is to make a Chrome extension and/or Firefox add-on instead. These can reliably close the current window.

However, since the security risks, posed by window.close, are much less for a Greasemonkey/Tampermonkey script; Greasemonkey and Tampermonkey could reasonably provide this functionality in their API (essentially packaging the extension work for you).
Consider making a feature request.

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The hacky workarounds:

Chrome is currently was vulnerable to the "self redirection" exploit. So code like this used to work in general:

open(location, '_self').close();

This is buggy behavior, IMO, and is now (as of roughly April 2015) mostly blocked. It will still work from injected code only if the tab is freshly opened and has no pages in the browsing history. So it's only useful in a very small set of circumstances.

However, a variation still works on Chrome (v43 & v44) plus Tampermonkey (v3.11 or later). Use an explicit @grant and plain window.close(). EG:

// ==UserScript==
// @name        window.close demo
// @include     http://YOUR_SERVER.COM/YOUR_PATH/*
// @grant       GM_addStyle
// ==/UserScript==

setTimeout (window.close, 5000);

Thanks to zanetu for the update. Note that this will not work if there is only one tab open. It only closes additional tabs.

Firefox is secure against that exploit. So, the only javascript way is to cripple the security settings, one browser at a time.

You can open up about:config and set
allow_scripts_to_close_windows to true.

If your script is for personal use, go ahead and do that. If you ask anyone else to turn that setting on, they would be smart, and justified, to decline with prejudice.

There currently is no equivalent setting for Chrome.

Chrome Fixed the security issues on version 36.0.1985.125

Chrome 36.0.1985.125 WEDNESDAY, JULY 16, 2014 Release note

From my observation, this update fixed the issue on using window.close() to close the popup window. You will see this in the console when it fail, "Scripts may close only the windows that were opened by it.". That means The hacky workarounds (Brock Adams's answer) may not work in the latest release.

So, in the previous Chrome released builds, the below code block may worked but not with this update.

window.open('', '_self', '');
window.close();

For this update, you have to update your code accordingly to close the popup window. One of the solution is to grab the popup window id and use

chrome.windows.remove(integer windowId, function callback)

method to remove it. Chrome extension windows API can be found at chrome.windows.

Actually my chrome extension MarkView was facing this issue and I had to update my code to make it work for this Chrome Update. By the way, MarkView is tool to read and write Awesome Markdown Files, it provides features including Content Outline, Sortable Tables and code block syntax highlight with line number.

I also created this post, any comments are welcome.

In tampermonkey now you can use

// @grant        window.close

And then just simply call

window.close();

Requrements for this to work:

You have to open the window/tab from a window launcher to get a javascript handle to have it work, as it does not always work on a tab that was not opened via a window-launcher script. This test page shows you how:

http://browserstrangeness.bitbucket.io/window_close_tester.htm

If you don't see it working from my launcher, posting your browser, your device and versions are necessary. Browsers of different versions act differently on different devices. (Such as Firefox and Chrome on iPads which are NOT what they say they are. They are Safari with a different skin!)

So it is important to say for example 'I am using Safari 10.14 on an iPad using iOs 14.5' so I (or some other helpful individual here at stackoverflow) can research it for you and post results to help other users. Thanks in advance for doing that. If you use the launcher and it works on my example for you, then it works.

I am using the method posted by Brock Adams and it even works in Firefox, if it's user initiated by being launched by button or link from another window.

open(location, '_self').close();

I am calling it from a button press so it is user initiated, and it is still working fine using Chrome 90, Internet Explorer 11, Edge, Safari 7-10 and ALSO Firefox 35 & 88. I tested using version 8.1 & 10 of Windows and Mac OS X 10.6, 10.9 & 10.10 & 10.14 if that is different.

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Self-Closing Window Code (on the page that closes itself)

The complete code to be used on the user-opened window that can close itself:

window_to_close.htm

JavaScript:

function quitBox(cmd)
{   
    if (cmd=='quit')
    {
        open(location, '_self').close();
    }   
    return false;   
}

HTML:

<input type="button" name="Quit" id="Quit" value="Quit" onclick="return quitBox('quit');" />

Here is that test page again with a working example: (Now tested in Chrome 90.0 and Firefox 88.0 -- both on Windows 10 and Mac 10.14 Mojave)

http://browserstrangeness.bitbucket.io/window_close_tester.htm

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Window Opener Code (on a page that opens the above page)

To make this work, security-imposed cross browser compatibility requires that the window that is to be closed must have already been opened by the user clicking a button within the same site domain.

For example, the window that uses the method above to close itself, can be opened from a page using this code (code provided from my example page linked above):

window_close_tester.htm

JavaScript:

function open_a_window() 
{
    window.open("window_to_close.htm"); 

    return false;
}

HTML:

<input type="button" onclick="return open_a_window();" value="Open New Window/Tab" />

Despite thinking it is "patently false", what you say "seems to be a belief" is actually correct. The Mozilla documentation for window.close says

This method is only allowed to be called for windows that were opened by a script using the window.open method. If the window was not opened by a script, the following error appears in the JavaScript Console: Scripts may not close windows that were not opened by script

You say that it is "supposed to still do it" but I don't think you'll find any reference which supports that, maybe you've misremembered something?

Many people are still trying to find a way to close the Chrome browser using javascript. The following method only works when you use Chrome as APP launcher - kiosk for example!

I have tested the following:

I'm using the following extension: Close Kiosk

I'm following the usage instructions and it seems to work just fine (make sure you clear the cache while doing the tests). The javascript I use is (attached to click event):

window.location.href = '/closekiosk';

I hope that helps somebody, as it's the only working solution I have found.

Note: It seems the extension runs in background and adds a Chrome tray icon. It has the following option checked: "Let Chrome run in background" (or similar text). You may need to play with it, until it work for you. I unchecked it and now it works just fine!