If you go to Netcenter, and one of their pop-up ads come up, it gets drawn on the Mac in the extreme upper left-hand corner of the screen, where the close bo is obscured. Selecting the window and selectin Command-W does not necessarily close the window; it often just results in the window being redrawn in all-white.

Not a layout problem. I'm assuming it's a widget problem

per leger, assigning QA contacts to all open bugs without QA contacts according to list at http://bugzilla.mozilla.org/describecomponents.cgi?product=Browser

Looks like a MAC specific widget issue.

Fixed. Note: these windows don't appear in AppRunner (only in Viewer) because it seems that JavaScript doesn't work in AppRunner. I opened a separate bug (#4181).

verified on MacOS 8.51, build 99032608

Moving all Widget Set bugs, past and present, to new HTML Form Controls component per request from karnaze. Widget Set component will be retired shortly.