Accidentally quitting Firefox is a big problem for all of us. One day I got tired of it happening over and over and wrote a simple add-on to catch all Meta-Q keypress and discard them.
Later, my colleague, Paul McLanahan helped make it more friendlier, and into its current state! Now it shows a nice panel asking you to press Meta-Q again to quit for sure. If you don't press it in 2 seconds, the panel will be hidden.
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