Please explain the problem in detail. What happens? What is/are the exact error message(s) ?

I want to disable some keyboard shortcuts (ctrl + w) After some research, I found that we can disable ctrl+w by removing: reserved = "true" from these two lines of the browser.xhtml file under omni.ja :

<key id="key_close" data-l10n-id="close-shortcut" command="cmd_close" modifiers="accel" reserved="true"/> <key id="key_closeWindow" data-l10n-id="close-shortcut" command="cmd_closeWindow" modifiers="accel,shift" reserved="true"/>

but I could not modify omni.ja

I called for more help.

The omni.ja file in Firefox's program folder is replaced every update, so although you can unpack it (using an Unzip tool), edit files, and put it back together, this is a very temporary fix. It's also not officially supported by this forum, as you would expect.

I recently saw a thread on Reddit about using an Autoconfig file (two files are actually involved) to modify Ctrl+Shift+b. You might take a look at this thread and perhaps there is a similar approach to modifying Ctrl+w that would work and wouldn't need to get redone after every update. I suppose you could reply to the author and see if they'll help.

• Customize Firefox using AutoConfig
• https://www.reddit.com/r/firefox/comments/kilmm2/restore_ctrlshiftb_library_by_setting_configjs/ (I have not tested this myself)

The two omni.ja archives are signed in current release (they contain a META-INF folder), so it isn't possible to edit them.

See:

• resource://gre/
• resource:///

You need to use other ways to achieve what you want like posted above.

What changes do you want to make ?

thank you for your reply I want to disable the closing of the browser when the user types ctrl + w or when he clicks on close window from the taskbar. so i thought about modifying browser.xhtml