Firebug Inspect shortcut fix
I always had an issue with Firebug’s inspector toggle shortcut (Shift+Ctrl+C). It never worked for me. I recently did quite a bit of googling, which revealed that a few people had the same issue, all remedies they suggested did not work for me.
Eventually I went into Tools > Firebug > Customize Shortcuts, then changed Toggle Inspecting value to something else, closed the window, then repeated procedure but on the last step I reset Toggle Inspecting back to original value (there is a button for it). And gues what!!! It started working!
P.S. as a result of this research I found a great shortcut management extension Keyconfig