Comment 7 for bug 427190

okay, tested a script by turning on output buffering, echo a few things including date and time, get the contents of the buffer and write it to a file then flush the buffer to display it to the browser.

When firefox presents the download box it also doesn't write the data into the file, otherwise it writes to the file and outputs to the browser as normal.

It seems to happen a lot less frequently with a simple script like that than it does it with my more complex scripts.