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No. There are various layers involved in window redrawing. There's of course X, but atop of that you have Gtk/Qt, and then individual apps that can draw asyncronous or not. So, when you resize Firefox window and can see the repainting, thats because the window is getting redrawed for each step without checking if the actual window content is ready to draw, so it gets 'choppy'.
Try doing the same thing with Compiz enabled. As Compiz caches window pixmaps, you won't get that 'choppy' thing, because the window gets redrawed when the content is actually ready to be draw.
Openbox also allows the option to not update windows while resizing until the window has been resized. This doesn't change the fact that the sites that cause Firefox to resize poorly also cause it to *scroll* poorly: http://bbs.archlinux.org/viewtopic.php?id=46531 . I don't think that has to do directly with the resizing of the window, something (possibly Firefox itself is abusing its lib calls...?) is having rendering issues of some type.
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