You can try something like this with code in the autoconfig.cfg file.

• http://forums.mozillazine.org/viewtopic.php?p=14845838#p14845838

See also:

• https://support.mozilla.org/en-US/kb/customizing-firefox-using-autoconfig

You need to remove this key binding for close tab (Ctrl+W):

<key id="key_close" data-l10n-id="close-shortcut" command="cmd_close" modifiers="accel" reserved="true" key="W"/>

I'm glad that there is at least a solution. However, I have limited privileges (non-admin Windows user) to apply this solution. That would be great if such option could be integrated in the preferences tab in next update for Mozilla Firefox.

Thank you for your volunteer assistance!

You can possibly run code in the Browser Console to disable this shortcut, but that only works for the current window and you need to remember to run the code. The Browser Console has a command stack and remembers commands you have used, so you may only need a cursor UP to recall this code and press ENTER if you have used this.

• "3-bar" menu button or Tools -> Web Developer
• https://developer.mozilla.org/en-US/Tools/Browser_Console

I use this code to disable Ctrl+Q to avoid accidentally closing Firefox (Q is next to W). You can easily add more key IDs.

• https://developer.mozilla.org/en-US/Tools/Browser_Toolbox

javascript:/*ACCESSKEY*/(function(){var wd = Services.wm.getMostRecentWindow("navigator:browser").window.document;function $(e){return(wd.getElementById(e))}function $(e){var N=$(e);if(N){N.removeAttribute("key"); N.removeAttribute("command");console.log(N)}return($(e))}$("key_quitApplication");$("key_privatebrowsing");$("key_close");})()

You can possibly use a bookmarklet (bookmark with this code in the location field) to get this JavaScript code in a prompt and copy it to the clipboard.

javascript:/*ACCESSKEY*/void(prompt('<accesskeys>',atob('amF2YXNjcmlwdDovKkFDQ0VTU0tFWSovKGZ1bmN0aW9uKCl7CnZhciB3ZCA9IFNlcnZpY2VzLndtLmdldE1vc3RSZWNlbnRXaW5kb3coIm5hdmlnYXRvcjpicm93c2VyIikud2luZG93LmRvY3VtZW50OwpmdW5jdGlvbiAkKGUpe3JldHVybih3ZC5nZXRFbGVtZW50QnlJZChlKSl9CmZ1bmN0aW9uICQkKGUpe3ZhciBOPSQoZSk7aWYoTil7Ti5yZW1vdmVBdHRyaWJ1dGUoImtleSIpOyBOLnJlbW92ZUF0dHJpYnV0ZSgiY29tbWFuZCIpO2NvbnNvbGUubG9nKE4pfXJldHVybigkKGUpKX0KJCQoImtleV9xdWl0QXBwbGljYXRpb24iKTsKJCQoImtleV9wcml2YXRlYnJvd3NpbmciKTsKJCQoImtleV9jbG9zZSIpOwp9KSgp')));

• https://developer.mozilla.org/en-US/docs/Glossary/Base64

You can possibly run code in the Browser Console to disable this shortcut, but that only works for the current window and you need to remember to run the code. The Browser Console has a command stack and remembers commands you have used, so you may only need a cursor UP to recall this code and press ENTER if you have used this.

• "3-bar" menu button or Tools -> Web Developer
• https://developer.mozilla.org/en-US/Tools/Browser_Console

I use this code to disable Ctrl+Q to avoid accidentally closing Firefox (Q is next to W). You can easily add more key IDs.

• https://developer.mozilla.org/en-US/Tools/Browser_Toolbox

---

javascript:/*ACCESSKEY*/(function(){var wd = Services.wm.getMostRecentWindow("navigator:browser").window.document;function $(e){return(wd.getElementById(e))}function $(e){var N=$(e);if(N){N.removeAttribute("key"); N.removeAttribute("command");console.log(N)}return($(e))}$("key_quitApplication");$("key_privatebrowsing");$("key_close");})()

You can possibly use a bookmarklet (bookmark with this code in the location field) to get this JavaScript code in a prompt and copy it to the clipboard.

javascript:/*ACCESSKEY*/void(prompt('<accesskeys>',atob('amF2YXNjcmlwdDovKkFDQ0VTU0tFWSovKGZ1bmN0aW9uKCl7CnZhciB3ZCA9IFNlcnZpY2VzLndtLmdldE1vc3RSZWNlbnRXaW5kb3coIm5hdmlnYXRvcjpicm93c2VyIikud2luZG93LmRvY3VtZW50OwpmdW5jdGlvbiAkKGUpe3JldHVybih3ZC5nZXRFbGVtZW50QnlJZChlKSl9CmZ1bmN0aW9uICQkKGUpe3ZhciBOPSQoZSk7aWYoTil7Ti5yZW1vdmVBdHRyaWJ1dGUoImtleSIpOyBOLnJlbW92ZUF0dHJpYnV0ZSgiY29tbWFuZCIpO2NvbnNvbGUubG9nKE4pfXJldHVybigkKGUpKX0KJCQoImtleV9xdWl0QXBwbGljYXRpb24iKTsKJCQoImtleV9wcml2YXRlYnJvd3NpbmciKTsKJCQoImtleV9jbG9zZSIpOwp9KSgp')));

• https://developer.mozilla.org/en-US/docs/Glossary/Base64

Thank you for such a great solution! You are genius :) Google provides so many threads regarding this issue, but none of them helped me as much as you. I have tried that javascript code, but it does not work or I don't know how to apply it. However, I have accessed the Browser Toolbox and deleted following node:

<key id="key_close" data-l10n-id="close-shortcut" command="cmd_close" modifiers="accel" reserved="true" key="W"/>

By deleting that node, I can use keyboard shortcut CTRL+W without to be closed browser tab. By the way, the correct link to documentation of Browser Toolbox is https://developer.mozilla.org/en-US/docs/Tools/Browser_Toolbox