Imacros get downloaded image file name in firefox - imacros

Question

I am using imacros in firefox and saving some images and I want to be able to store the saved images names in a variable, but it seems that the code at the end of my code below
SET !EXTRACT {{!DOWNLOADED_FILE_NAME}}
PROMPT {{!DOWNLOADED_FILE_NAME}}
does not work in firefox, only in ie, does anyone no how I can save the filename of the image into a variable for latter use in my imacros script in firefox browser, I prefer not to use ie browser if at all possible
thanks
VERSION BUILD=8881205 RECORDER=FX
SET !ERRORIGNORE YES
SET !TIMEOUT_PAGE 10
SET !TIMEOUT_TAG 0
SET !WAITPAGECOMPLETE YES
SET !EXTRACT_TEST_POPUP NO
TAB T=1
URL GOTO=http://www.somerandomsite.com
TAG POS=5 TYPE=INPUT:SUBMIT ATTR=*
TAG POS=1 TYPE=IMG ATTR=SRC:http://*.jpg
ONDOWNLOAD FOLDER=C:\Users\pb\Pictures\produts FILE=* WAIT=YES
'Download the picture
TAG POS=1 TYPE=IMG ATTR=SRC:http://*.jpg CONTENT=EVENT:SAVEITEM
TAG POS=2 TYPE=DIV ATTR=CLASS:iv_thumb_image&&TXT:
ONDOWNLOAD FOLDER=C:\Users\pb\Pictures\produts FILE=* WAIT=YES
'Download the picture
TAG POS=1 TYPE=IMG ATTR=SRC:http://*.jpg CONTENT=EVENT:SAVEITEM
SET !EXTRACT {{!DOWNLOADED_FILE_NAME}}
PROMPT {{!DOWNLOADED_FILE_NAME}}