Iceweasel quits on ^Q even when options and add-on say not to

[Carl Fink <carl@finknetwork.com>]

I'm using Iceweasel 10.0.5 under Wheezy. I fairly often press ^Q (quit) when
I mean ^W (close tab).

And Iceweasel closes, with no confirmation dialog and even if multiple tabs
are open.

I have set the option "Warn me when closing multiple tabs". It doesn't.

I even installed the extension "Show Quit Warning". It doesn't either.

Any suggestions on how to proceed, or should I just file a bug?

Other installed extensions include:

Adblock Plus
DownloadHelper
DownThemAll
Flashblock
Image Zoom
Newsfox

Thanks.
-- 
Carl Fink                           nitpicking@nitpicking.com 

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