nsICategoryManager Interface

 Add an entry to a category.
 @param aCategory The name of the category ("protocol")
 @param aEntry The entry to be added ("http")
 @param aValue The value for the entry ("moz.httprulez.1")
 @param aPersist Should this data persist between invocations?
 @param aReplace Should we replace an existing entry?
 @return Previous entry, if any

string addCategoryEntry(in string aCategory, in string aEntry, in string aValue, in boolean aPersist, in boolean aReplace)

 Delete a category and all entries.
 @param aCategory The category to be deleted.

void deleteCategory(in string aCategory)

 Delete an entry from the category.
 @param aCategory The name of the category ("protocol")
 @param aEntry The entry to be added ("http")
 @param aPersist Delete persistent data from registry, if present?

void deleteCategoryEntry(in string aCategory, in string aEntry, in boolean aPersist)

 Enumerate all existing categories
 @param aCategory The category to be enumerated.
 @return a simple enumerator, each result QIs to
         nsISupportsCString.

nsISimpleEnumerator enumerateCategories()

 Enumerate the entries in a category.
 @param aCategory The category to be enumerated.
 @return a simple enumerator, each result QIs to
         nsISupportsCString.

nsISimpleEnumerator enumerateCategory(in string aCategory)

 Get the value for the given category's entry.
 @param aCategory The name of the category ("protocol")
 @param aEntry The entry you're looking for ("http")
 @return The value.

string getCategoryEntry(in string aCategory, in string aEntry)