259158 - what is the mystery extra window for?

Status: VERIFIED DUPLICATE of bug 223545

(Firefox :: General, defect)

Description

[david young]

User-Agent:       Mozilla/5.0 (Macintosh; U; PPC Mac OS X Mach-O; en-US; rv:1.7) Gecko/20040803 Firefox/0.9.3
Build Identifier: Mozilla/5.0 (Macintosh; U; PPC Mac OS X Mach-O; en-US; rv:1.7) Gecko/20040803 Firefox/0.9.3

When I launch, and at all times when I'm running, there is an extra window
open... it's a small square window that I can only see when I hit F9 to invoke
Expose - and then it appears. If I command-esc through my Firefox windows the
mystery window is one that gets rotated through (I can tell because the other
window will loose focus - although the mystery window seems to be positioned
offscreen).

The problem is that by loosing focus to this mystery window I get really
confused why keyboard commands don't work on the window that appears to be active.

What causes this window to appear? How can we kill it?

Reproducible: Always
Steps to Reproduce:
1.
2.
3.

Comment 1

[HARUNAGA Hirotoshi]

*** This bug has been marked as a duplicate of 223545 ***