Link: http://mozilla.dorando.at/keyconfig.xpi:

Allows you to change shortcut keys. Set the following:

• Ctrl-Shift-P: Preferences. Code: openPreferences();
• Ctrl-Shift-A: Addons. Code: BrowserOpenAddonsMgr();
• Ctrl-Shift-K: Keyconfig
• Ctrl-Shift-D: downloads
• Ctrl-Y: undo