Scenario: Inspect an element in Firebug, click the inspect button (or flashlight icon in the new version 1.4.0b5).
The problem: But you want to do this with a keyboard shortcut.
The solution: Ctrl+Shft+C
Some concerns: With the number of extensions Firefox offers you may experience keyboard shortcut clashes, like for example with the CacheViewer which uses Crtl+Shft+C also.
Firebug is a free Firefox extension. Ready to install?
From several reponses received and from my own expreience since I upgraded to Windows 7 from Windows XP the Ctrl+Shift+C now oepens a new tab showing the CSS file. The Firbug suggested shortcut does not work anymore.
For a cheat-sheet of Firebug shortcuts go to