Scripts on ESRI website
All true....but sometimes it's nice to look up the really old stuff too. 
Until ArcScripts 2.0 is online, some things can be found thru arcgis.com, e.g.
http://www.arcgis.com/home/search.html?q=scripts&t=content&focus=tools&sortField=modified&sortOrder=... some tools, and
can bring up Python scripts, etc.
Although we haven't heard any release date for ArcScripts 2.0, my guess is it will be announced around the UC in July. that's just a guess since that always seems to be a target date for many releases.....gets the ooohs and aaahhs from the crowd.
I just re-read your original quesiton. Are you just looking for a tool in ArcMap/catalog? If you open up the "Search" window (in ArcMap, for example, Windows->Search ....i think Ctrol-F might also work, at least in 10.3) then type "foorprints" in the search box
That will give you a bunch of options. Again, my guess, since I haven't tested all the options, is you will want to create 1) a file geodatabase (FGDB), 2) a mosaic or raster dataset inside the FGDB, 3) add your raster images to the dataset, at which type you can have it build footprints...or add the rasters and have it create the footprints as a separate step.
Is that more what you were looking for? (the "scripts" term in your questions threw some of us off I think. I know I tend to look at key words like that and miss the Toolbar part.....sorry)
FWIW, looks like you might (very strong "might") be able to contact the author of the script to see if they have an update....it the other doesn't pan out. Christian Maire Below is from the ArcScripts page...but I would use GeoNet to connect (hopefully I have the correct person cc'd.
