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This feature is non-standard and is not on a standards track. Do not use it on production sites facing the Web: it will not work for every user. There may also be large incompatibilities between implementations and the behavior may change in the future.
A privileged exension to the
File interface, the
mozFullPath property contains the full pathname of the represented file. This property is only available from within browser code or old-style XPCOM-based Firefox extensions. It is not available to web content.