For those having Firefox trouble, the quickest fix is to right click the red menu on the left and select: "Open Link in New Tab" and then click on the new tab at the top of your browser window.

The Frameset in the Jett web site does not contain ROWS or COLS values in the source code and that's why the frames are breaking with Firefox. I will email the Jett Webmaster and tell them to add these values which should fix the issue.