I wrote a Thunderbird extension (and my first one too!) that allows the display of all available about: windows in Thunderbird. Shredder Alpha 3 and above is required though. It is called ViewAbout and can be downloaded from Mozilla Add-ons.

Description of ViewAbout:

Enables access to various about: dialogs from the View menu.
Every available about: dialog can be viewed – about:buildconfig, about:config, about:crashes, about:credits, about:license, about:mozilla, about:neterror (seemingly useless) and about:plugins.
These windows can be closed using Ctrl-(or cmd-)w.

Try it and let me know how it is. I have also made ViewAbout’s AMO Dashboard public, so everyone can see just how many users need about:crashes or about:config and the like.

(Mark Finkle was a great help throughout the development period, so thanks, Mark!)