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Many, many times, I accidentally press +Q when I meant to close a tab or window, or switch applications. When I saw the option in Google Chrome to require the shortcut to be held, I was overjoyed. Problem is, I use Safari.

So, in short: How can I make the "hold command-Q" shortcut universal across all of my applications (or at least Safari)?

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Where is this setting you speak of? – Senseful Mar 22 '12 at 20:02
Awesome question Timothy!! – daviesgeek Mar 22 '12 at 20:03
@Senseful It's counterintuitively under the Chrome menu, rather than Chrome preferences. – timothymh Mar 22 '12 at 20:04
"Warn Before Quitting." – timothymh Mar 22 '12 at 20:04
Great question, leading to very useful answers! – Paul Wagland Mar 29 '12 at 21:33
up vote 6 down vote accepted

Another option is to use Karabiner with the following XML:

__HoldingKeyToKey__ KeyCode::Q, VK_COMMAND | ModifierFlag::NONE, KeyCode::VK_NONE, KeyCode::Q, VK_COMMAND, Option::NOREPEAT

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While the application has been renamed to Karabiner, this answer worked great for me on 10.10 and was completely free. – Alex Pretzlav Apr 22 '15 at 20:28

Here's a partial solution for starters:

Preventing accidental quitting in Safari (or any specific application)

Simply set up an unusual keyboard shortcut for the "Quit Safari" menu item in Keyboard preferences.

This will disable the standard Q shortcut, so accidentally hitting it doesn't make a difference — and you have to think before you quit!

(Unfortunately, I haven't found an easy way to do this for every application, without entering each one manually.)

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Very nice, I have implemented, and upvoted! As an aside, by default ⌥⌘Q is "Quit and discard Windows". – Paul Wagland Mar 29 '12 at 21:37
Oh drat, you're right. Well, ⌃⌘Q or something else should work too — however I find ⌥⌘Q a little harder to hit by accident. – jtbandes Mar 29 '12 at 21:58

Continuing on jtbandes' solution, once you have remapped the standard Quit command to a different keystroke (yes, sadly, you need to remap it manually for every application you are worried about accidentally quitting), you can create a service in Automator that takes no input. It should have a single action: Run AppleScript. The script is:

tell application "System Events"
    set theName to name of the first process whose frontmost is true
end tell
tell application theName
    display dialog "Are you sure you want to quit?"
end tell

You then save that service (I called mine "SafeSave"), and assign the service the keystroke Q. You have thus reclaimed the standard keystroke.

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Clever. Hm, I suppose one could write a script to activate on cmd-Q which would then require another cmd-Q to complete the quit... – timothymh Mar 23 '12 at 0:42
Clever, indeed! Have an up vote! :-) – Asmus Mar 23 '12 at 8:37
Very nice, I have implemented, and upvoted! – Paul Wagland Mar 29 '12 at 21:34

Douglas Teoh has made an app called SlowQuitApps, that does exactly this.

An OS X app that adds a global delay of 1 second to the Cmd-Q shortcut. In other words, you have to hold down Cmd-Q for 1 second before an application will quit.

When the delay is active, an overlay is drawn at the center of the screen.

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I can't believe people are actually writing apps to achieve this. Way to go “intuitive Apple!” – Stewart Apr 1 at 12:05

CommandQ ($4.00) does exactly this. It's very customizable and has a nice GUI, though I haven't used it personally. It seems to fulfil the requirements of this question.

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I don't believe that's possible.

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