when mozilla doesn't ask you what you want to do with the file it probably means it wants to play with it, ie it thinks its a mozilla theme or something. First thing to try, right click the download link, Save Link As or whatever. If you get the same problem, whip out konqueror for your kdelook.org needs. But with konqueror, theres a stupid god damned bug that makes the Ark viewer in konqueror save the file its opening to a temporary file thats random, but with the real file extension tacked on. Well guess what, for tar.gz files ark saves something like blah.tar.gz to sdifj438sdofij.gz . note the missing ".tar" before the .gz. This problem is easy to deal with, just either let it go, right click on the konqueror48sdf8 blah file and click Extract, then open do a tar -xf <file> on it. Or you can right click and do save link as.