nsIUpdatePrompt Interface

 Shows a user interface that checks for and then displays the available
 updates.

void checkForUpdates()

 Show a message advising that an update is available for download and
 install.
 @param   update
          The update to be downloaded and installed

void showUpdateAvailable(in nsIUpdate update)

 Show a message advising that an update has now been downloaded and that
 a restart is necessary to complete the update.
 @param   update
          The update that was downloaded
 @param   background
          Less obtrusive UI, starting with a non-modal notification alert

void showUpdateDownloaded(in nsIUpdate update, [optional] in boolean background)

 Shows an error message UI telling the user about some kind of update
 failure, e.g. failure to apply patch.
 @param   update
          The nsIUpdate object which we could not install

void showUpdateError(in nsIUpdate update)

 Shows a list of all updates installed to date.
 @param   parent
          A parent window to anchor this window to. Can be null.

void showUpdateHistory(in nsIDOMWindow parent)

 Shows a message that an update was installed successfully.

void showUpdateInstalled()