How can I prevent users from closing firefox using the "x" on the uppe right corner of the window?
i would like to prevent users from closing firefox using the "x" button on the upper right corner of the window.
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I don't think that this is possible. Even if you would hide this close button then there are always other ways to close Firefox (e.g. Alt+Space or the File menu or keyboard shortcuts like Alt+F4).
Add code to the userChrome.css file below the default @namespace line.
@namespace url("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"); /* only needed once */
#titlebar-close { display:none!important; }
It is not that difficult to create userChrome.css if you have never used it.
The first step is to open the "Help -> Troubleshooting Information" page and find the button to access the profile folder.
You can find this button under the "Application Basics" section as "Profile Folder -> Open Folder". If you click this button then you open the profile folder in the Windows File Explorer. You need to create a folder with the name chrome in this folder (name is all lowercase). In the chrome folder you need to create a text file with the name userChrome.css (name is case sensitive). In this userChrome.css text file you paste the text posted.
In Windows saving the file is usually the only time things get more complicated because Windows can silently add a .txt file extension and you end up with a file named userChrome.css.txt. To avoid this you need to make sure to select "All files" in the dialog to save the file in the text editor using "Save File as".
You need to close and restart Firefox when you create or modify the userChrome.css file.