One of the coolest features of the Opera web browser is that it supports multiple sub-windows within a single browser window. Each sub-window has its own history, so the user can navigate independently in each one. Since the sub-windows are all managed within a single OS-level window, clutter at the desktop level is minimized. There's a task bar at the bottom of the Opera window, with a button for each sub-window. Eudora is another application that has a similar feature; I'm sure there are others. I suggest adding something like this to Mozilla, at least as a user-selectable option.

dup of 59126 "[RFE]multiple windows in one" *** This bug has been marked as a duplicate of 59126 ***

Verified dupe.