nsIExtensionManager Interface

 Adds active download entries to the UI
 @param   items
          A list of nsIUpdateItems to entries to add
 @param   itemCount
          The length of |items|
 @param   manager
          null when called from chrome
          the XPInstallManager when not called from chrome (e.g. web page)

 @throws  NS_ERROR_ILLEGAL_VALUE if any item is invalid, or if itemCount == 0.

void addDownloads([array, size_is(itemCount)] in nsIUpdateItem items, in unsigned long itemCount, in nsIObserver manager)

 Adds an install listener so the front end can listen to download
 and install progress.
 @param   listener
          The listener to add
 @returns the index of the added listen in the listener list.

long addInstallListener(in nsIAddonInstallListener listener)

 Cancels a pending install or upgrade of an item. If the item does
 not have a pending install or upgrade then this will do nothing.
 @param   id
          The ID of the item.

void cancelInstallItem(in AString id)

 Cancels a pending uninstall of an item
 @param   id
          The ID of the item.

void cancelUninstallItem(in AString id)

 Determines if there are incompatible items installed (and offers to
 upgrade them to newer versions if available, via a UI).
 @returns true if there were incompatible items that were disabled
          and the application needs to restart to re-register components,
          chrome etc, false otherwise.

boolean checkForMismatches()

 Disables an enabled item
 @param   id
          The GUID of the item.

void disableItem(in AString id)

 Enables a disabled item
 @param   id
          The GUID of the item.

void enableItem(in AString id)

 Retrieves a list of installed nsIUpdateItems of items that are dependent
 on another item.
 @param   id
          The ID of the item that other items depend on.
 @param   includeDisabled
          Whether to include disabled items in the set returned.
 @param   countRef
          The XPCJS reference to the number of items returned.
 @returns An array of installed nsIUpdateItems that depend on the item
          specified by the id parameter.

void getDependentItemListForID(in AString id, in boolean includeDisabled, out unsigned long itemCount, [array, retval, size_is(itemCount)] out nsIUpdateItem items)

 Retrieves a list of nsIUpdateItems of items that are incompatible
 with the supplied parameters.
 @param   id
          The id of the application to check compatibility against
 @param   appVersion
          The version of the application to check compatibility against
 @param   platformVersion
          The version of the toolkit to check compatibility against
 @param   type
          The type of item to return
 @param   includeDisabled
          true if disabled items should be included in the result set,
          false otherwise
 @param   countRef
          The XPCJS reference to the number of items returned.
 @returns An array of incompatible nsIUpdateItems.

void getIncompatibleItemList(in AString id, in AString appVersion, in AString platformVersion, in unsigned long type, in boolean includeDisabled, out unsigned long itemCount, [array, retval, size_is(itemCount)] out nsIUpdateItem items)

 Gets the Install Location for an item
 @param   id
          The GUID of the item
 @returns The Install Location where the item is installed or null if the
          location cannot be obtained (e.g. an invalid id).

nsIInstallLocation getInstallLocation(in AString id)

 Gets a nsIUpdateItem for the item with the specified id.
 @param   id
          The GUID of the item to construct a nsIUpdateItem for.
 @returns The nsIUpdateItem representing the item or null if the item does
          not exist.

nsIUpdateItem getItemForID(in AString id)

 Retrieves a list of visible nsIUpdateItems of items matching the
 specified type.
 @param   type
          The type of item to return.
 @param   countRef
          The XPCJS reference to the number of items returned.
 @returns An array of nsIUpdateItems matching the id/type filter.

 XXXben - it would be good if this function took an optional
          install location.

void getItemList(in unsigned long type, out unsigned long itemCount, [array, retval, size_is(itemCount)] out nsIUpdateItem items)

 Installs an item from a XPI/JAR file into the location specified.
 @param   xpiFile
          The source file to install from. This function stages a copy
          of this file for persistence across potential application
          restarts, you are responsible for removing the file you pass
          in.
 @param   installLocationKey
          The name identifier of an Install Location to install into.

void installItemFromFile(in nsIFile xpiFile, in AString installLocationKey)

 Move an Item to the index of another item in its container.
 @param   movingID
          The ID of an item to be moved.
 @param   destinationID
          The ID of an item to move an item to.

void moveToIndexOf(in AString movingID, in AString destinationID)

 Removes an active download from the UI
 @param   url
          The URL of the active download to remove

void removeDownload(in AString url)

 Removes an install progress listener.
 @param   index
          The index of the listener to remove.

void removeInstallListenerAt(in long index)

 Sorts addons of the specified type by the specified property in the
 Extensions Datasource container starting from the top of their container.
 If the addons are already sorted then no action is performed.
 @param   type
          The nsIUpdateItem type of the items to sort.
 @param   propertyName
          The RDF property name used for sorting.
 @param   isAscending
          true to sort ascending and false to sort descending

void sortTypeByProperty(in unsigned long type, in AString propertyName, in boolean isAscending)

 Starts the Extension Manager, checking for item changes, additions and
 removals, and finishing pending operations.
 @returns true if the application has rewritten the extensions.ini file
          and needs to restart to register components/chrome etc,
          false otherwise

boolean start()

 Uninstalls an item
 @param   id
          The GUID of the item.

void uninstallItem(in AString id)

 Checks for updates to a list of items.
 @param   items
          An array of nsIUpdateItems to check for updates for.
 @param   itemCount
          The length of |items|
 @param   updateCheckType
          UPDATE_CHECK_NEWVERSION if this check should find the newest
          versions available and write the results to the extensions
          datasource.
          UPDATE_CHECK_COMPATIBILITY if this check should only find newer
          target application compatibility information for the currently
          installed version and write the results to the extensions
          datasource.
          UPDATE_SYNC_COMPATIBILITY if this check should only find target
          application compatibility information for the currently
          installed version and synchronize the values to the extensions
          datasource.
          UPDATE_NOTIFY_NEWVERSION if this check should find the newest
          versions available without updating the extensions datasource.
 @param   listener
          An nsIAddonUpdateCheckListener object which will be notified
          during the update check process. If not null, the object's
          onUpdateStarted() and onUpdateEnded() methods will be called even
          if there are no items to update.
 @param   appVersion (optional)
          The version of the application to check for compatible updates.
          This param is only honored when updateCheckType is equal to
          UPDATE_NOTIFY_NEWVERSION and it defaults to the current version of
          the application when it is not specified.
 @param   platformVersion (optional)
          The version of the toolkit to check for compatible updates.
          This param is only honored when updateCheckType is equal to
          UPDATE_NOTIFY_NEWVERSION and it defaults to the current version of
          the toolkit when it is not specified.

 @throws  NS_ERROR_ILLEGAL_VALUE if any item is invalid.

void update([array, size_is(itemCount)] in nsIUpdateItem items, in unsigned long itemCount, in unsigned long updateCheckType, in nsIAddonUpdateCheckListener listener, [optional] in AString appVersion, [optional] in AString platformVersion)

 Checks for changes to the blocklist using the local blocklist file.
 This will immediately application disable items that have been hard blocked
 and application enable items that are no longer hard blocked. It will also
 return items that are either soft or hard blocked and aren't already
 disabled or disabled pending a restart.

 This is likely to change or go away in the future and should not be used
 by anyone outside of the blocklist service.

 @returns An array of nsIUpdateItems that are blocklisted or the user should
          be warned about but are currently enabled.

void updateAndGetNewBlocklistedItems(out unsigned long itemCount, [array, retval, size_is(itemCount)] out nsIUpdateItem items)