mozilla/mozmill — pull request #81 by davehunt (2012-07-31 00:32:16+00:00)
Title: Bug 762126 - Allow to specify the screenshot path via the persisted object (CLI option)

This created the file in the appropriate directory, however I was unable to open the image even if it was created in the temporary path location. There also seems to be some discrepancy with file types - a comment mentions PNG but the file name is JPG.