The only solution in to uninstall firefox 4 (just drop the icon of firefox in the trash) and reinstall Firefox 3.6 (look for the old disk-image in your download folder). I did it in 3 minutes and now I am back with the very good old Firefox 3.6.13 To find the old Firefox 3.6 in yous computer, try to look in the download folder (where your computer piles up all the downloaded files you have). In Mac computers it is usually in the dock; but I had to search back a lot to find it because it was downloaded more than one year ago. In PC I don't know exactly, but there must be a "download folder" in the user folder (a folder with your username)

OK- This fix worked for me: And it gives good illustrated instructions. Go to this link: http://planetlotus.org/profiles/gavin-bollard_87852

Only tricky part for me was figuring out what my university's domain server name was so that I could get the add on to work. BTW: Here's the ad on: https://addons.mozilla.org/en-us/firefox/addon/remote-xul-manager/

Cheers!- Professor Barney McCoy, University of Nebraska-Lincoln