We have a link in one of our web pages. On click of this link we open a pop-up window in which we display all documents that a user has uploaded to our application. We are opening the pop-up window as a model dialog using the function 'window.showModalDialog()' in javascript. We have a download link for each attachment uploaded. The download link triggers a post-back event which downloads a file from the server. During the download, the 'save-as' dialog box opens. Now the problem is, during the execution of above scenario in Mozilla Firefox browser, once the 'save as' dialog box opens (as shown in the attachment), the whole dialog box freezes. The 'save-as' or 'Cancel' buttons does not work. The 'save as' dialog box can be closed only using the window close (X) button. As a result, we are not able to download the file which we intend to. This problem does not occur with the Internet Explorer browser and so we are able to download the file. We are facing this problem only with Mozilla Firefox.