How can I get Firefox 5 Mac to warn me before quitting?

Using Firefox 4, a warning dialog was displayed before I quit the browser. This warning is essential to me since I work through a web application and risk losing work if I accidentally quit. I frequently use Cmd+W to close tabs, and Cmd+Q is an easy slip of the finger.
I have the following config settings:
browser.showQuitWarning = true
browser.warnOnQuit = true
Is there any way to get the quit confirmation dialog back? Alternatively, as a workaround, is there any way to remap or disable the Cmd+Q shortcut?

I keep the Ctrl+Q key disabled on Linux to avoid closing Firefox by accident as it is to easily to hit Ctrl+Q instead of Ctrl+W like you wrote.
Maybe this extension also works on a Mac:
*http://kb.mozillazine.org/User:Dickvl#Keysdisable
Here is a modified version for the key_closeWindow and key_quitApplication shortcut keys.
<pre><nowiki>
<keyset id="mainKeyset">
<key id="key_closeWindow" removeelement="true"/>
<key id="key_quitApplication" removeelement="true"/>
</keyset>
</nowiki></pre>
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