When you install Fiddler, it installs a Firefox plugin by writing a
registry key inside HKLM\Software\Mozilla\Firefox\Extensions
The key is named "
fiddl...@fiddler2.com" and points to the folder:
"$INSTDIR\FiddlerHook"
The FiddlerHook options are shown on the Tools menu and in the Firefox
addons/status bar (which is now hidden by default in current versions
of Firefox but can be reenabled on the VIEW menu.)
-Eric