Insert image in WYSIWYG editor fails in Fire Fox Mac 3.6.9

Using Mac and Version of Firefox = 3.6.9
other stuff from "about" box = Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.6; en-US; rv:1.9.2.9) Gecko/20100824 Firefox/3.6.9

Edit Wiki page,
Attache image file
Choose insert picture
Then click an uploaded file name to insert it
Adjust to horizontal (This might not be needed)
Hit insert

nothing happens.

Work correctly with FF 3.5.7 (Need to test on Windows and Linux)
reported by Christine Mytko.