Print preview triggers warning in Linux/FF

[raj]

On Ubuntu 10.10 / Firefox 3.6:

Choosing "Print Preview" from the File menu triggers an alert, that fires twice.

A dialog box pops up that says Alert: "The document cannot change while Printing or in Print Preview." After you click OK it pops up one more time. Otherwise, print preview works fine. The print function doesn't trigger this alert.

Also note that on OS X, there is no Print Preview option in the File menu, and the system print preview (launched via the print dialog) doesn't trigger an error, but also don't show the page images.