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→Background updates
* The updater binary checks to see if there is an existing <code>FIREFOX_NEW</code> directory.
** If this directory exists, it will be removed.
* In case of a partial update, the The existing installation will be copied into <code>FIREFOX_NEW</code>.
* The updater binary will go ahead and apply the update to the <code>FIREFOX_NEW</code> directory using the existing installation directory as the base. Any errors happening during this phase (such as running out of disk space or failing to write to disk) will be handled by the updater process by removing the <code>FIREFOX_NEW</code> directory and aborting. The updater binary will also write to the manifest file "failed: n" where n is the reason code.
* The updater binary will write "applied" to the manifest file.
