Is it "SmarterMail"? This is a compatibility problem with Firefox 31. The publisher of the software made an update available last month, but some service providers and companies may require more time to implement it. In the meantime, you can block website scripts from resizing windows. It's a bit of a sledgehammer, but users have reported that it does stop the SmarterMail script from rolling up the window. Here's how: (1) In a new tab, type or paste '''about:config''' in the address bar and press Enter. Click the button promising to be careful. (2) In the search box above the list, type or paste '''dom''' and pause while the list is filtered (3) Double-click the '''dom.disable_window_move_resize''' preference to switch it from false to true. More background: [https://support.mozilla.org/questions/1013240 Popup windows are small and cannot be resized in Firefox v31.0. v30.0 and earlier does not have this problem. Example: Hostgator's SmarterMail. XP, 7, 8.1.]