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by ellipsis_12 1692 days ago
For now at least it's possible to disable the CMD+Q shortcut entirely by setting the option "browser.quitShortcut.disabled" to true in about:config. This disables the keyboard shortcut and makes it so that the only way to quit is to select the Quit option from the File menu which is hard to do by accident.

Signed: a fellow Mac user who pressed CMD+Q by accident one too many times.