nsIComponentRegistrar in Firefox 1.5

 autoRegister

 Register a component file or all component files in a directory.  

 Component files must have an associated loader and export the required
 symbols which this loader defines.  For example, if the given file is a
 native library (which is built into XPCOM), it must export the symbol 
 "NSGetModule".  Other loaders may have different semantics.

 This method may only be called from the main thread.
 
 @param aSpec    : Filename spec for component file's location. If aSpec 
                   is a directory, then every component file in the
                   directory will be registered.  
                   If the aSpec is null, then the application component's
                   directory as defined by NS_XPCOM_COMPONENT_DIR will be 
                   registered  (see nsIDirectoryService.idl)

 @return NS_OK   : Registration was successful.
         NS_ERROR: Method failure.

 autoUnregister

 Unregister a component file or all component files in a directory.  
 This method may only be called from the main thread.

 @param aSpec    : Filename spec for component file's location. If aSpec 
                   is a directory, the every component file in the directory 
                   will be registered.  
                   If aSpec is null, then the application component's 
                   directory as defined by NS_XPCOM_COMPONENT_DIR will be 
                   registered. (see nsIDirectoryService.idl)

 @return NS_OK     Unregistration was successful.
         NS_ERROR* Method failure.

 CIDToContractID

 Returns the Contract ID for a given CID, if one exists and is registered.

 @return : Contract ID.

 contractIDToCID

 Returns the CID for a given Contract ID, if one exists and is registered.

 @return : Contract ID.

 enumerateCIDs

 Enumerate the list of all registered CIDs.

 @return : enumerator for CIDs.  Elements of the enumeration can be QI'ed
           for the nsISupportsID interface.  From the nsISupportsID, you 
           can obtain the actual CID.

 enumerateContractIDs

 Enumerate the list of all registered ContractIDs.

 @return : enumerator for ContractIDs. Elements of the enumeration can be 
           QI'ed for the nsISupportsCString interface.  From  the
           nsISupportsCString interface, you can obtain the actual 
           Contract ID string.

 isCIDRegistered

 Returns true if a factory is registered for the CID.

 @param aClass : CID queried for registeration
 @return       : true if a factory is registered for CID 
                 false otherwise.

 isContractIDRegistered

 Returns true if a factory is registered for the contract id.

 @param aClass : contract id queried for registeration
 @return       : true if a factory is registered for contract id 
                 false otherwise.

 registerFactory

 Register a factory with a given ContractID, CID and Class Name.

 @param aClass      : CID of object
 @param aClassName  : Class Name of CID
 @param aContractID : ContractID associated with CID aClass
 @param aFactory    : Factory that will be registered for CID aClass

 @return NS_OK        Registration was successful.
         NS_ERROR*    method failure.

 registerFactoryLocation

 Register a factory with a given ContractID, CID and Class Name

 @param aClass      : CID of object
 @param aClassName  : Class Name of CID
 @param aContractID : ContractID associated with CID aClass
 @param aFile       : Component File. This file must have an associated 
                      loader and export the required symbols which this 
                      loader specifies.
 @param aLoaderStr  : Opaque loader specific string.  This value is
                      passed into the nsIModule's registerSelf
                      callback and must be fowarded unmodified when
                      registering factories via their location.
 @param aType       : Component Type of CID aClass.  This value is
                      passed into the nsIModule's registerSelf
                      callback and must be fowarded unmodified when
                      registering factories via their location.

 @return NS_OK        Registration was successful.
         NS_ERROR*    Method failure.

 unregisterFactory

 Unregister a factory associated with CID aClass.

 @param aClass   : CID being unregistered
 @param aFactory : Factory previously registered to create instances of
                   CID aClass.

 @return NS_OK     Unregistration was successful.
         NS_ERROR* Method failure.

 unregisterFactoryLocation

 Unregister a factory associated with CID aClass.

 @param aClass   : CID being unregistered
 @param aFile    : Component File previously registered

 @return NS_OK     Unregistration was successful.
         NS_ERROR* Method failure.