The Extension Manager, which ships with Fireworks and many other Adobe Creative Suite applications, can be launched directly from the Fireworks main menu by selecting Help Manage Extensions. This tool is used to manage (install, uninstall, enable, and disable) extensions for all of the Adobe applications that support extensions.
Following are the default locations for the Extension Manager:
Windows: C:\Program Files\Adobe\Adobe Extension Manager CS4\Adobe Extension Manager CS4.exe
Mac OS X: /Applications/Adobe Extension Manager CS4/Adobe Extension Manager CS4.app
Launch the Extension Manager and select Fireworks ...