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In silent download mode, Firefox will use byte-range requests (supported by the Mozilla.org mirror network) to download the update package in small pieces. Each time Firefox starts up it will check to see if it should resume downloading the update package. It will not try to download the update package while Firefox is not running. This simplifies the implementation of the downloading system because it enables us to make use of the Firefox networking stack. Firefox will try to minimally impact the user's network bandwidth in the process.
Once the update package has been completely downloaded, it's its integrity will be verified by computing a hash (e.g., SHA-2) over the entire update package. This hash will be compared to a hash included in the XML file received from AUS. If the hash checks out, then assuming that Firefox has permission from the user, it will unpack the update package and signal Firefox to start the upgrade process.
== Processing the Update ==
