9.6. Commands and XPCOM Components
Although functors and controllers can be created entirely in JavaScript, XPCOM equivalents also exist. The simple combination of functor, controller, and dispatcher can also be enhanced in a number of ways. These enhancements allow command implementations to be added or removed from controllers dynamically. They also allow extra information to be associated with a given command. None of these enhancements is required for ordinary use of the command system.
If these enhancements are considered, then Mozilla has enough command-related XPCOM objects and interfaces to make your head swim. A naming policy that concatenates and reuses descriptive keywords does not help; instead, it tends to make the different interfaces ...
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