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Because this process is slow, it can take a day or more to reduce a full run or data. In many cases you are interested in a particular object. You can choose a subset of the full target list to extract to speed the process. To do this, simply highlight the names of the targets you want to extract given the list at right of the panel. If you have already reduced some of your frames, firehose will not re-reduce them unless the "Clobber" button is pressed.
The "Interactive" button gives you an option to check intermediate steps in the process. It is not recommended for novices, as there are many stops in the code that make a pipeline reduction tedious.