When Firefox desktop icon click'd for a new window, all existing windows first refresh with the new FF window on top; how to keep other windows minimized?

Oldest FF windows are overlaid by newer FF with the new FF window on top.
This wastes time & monitor-space.
It is likely just a simple setting somewhere ...
== This happened ==
Every time Firefox opened
== With version 3.6.6.

This can be caused by a problem with an extension (Tools > Add-ons > Extensions)
Start Firefox in [[Safe Mode]] to check if one of your add-ons is causing your problem (switch to the DEFAULT theme: Tools > Add-ons > Themes).
See [[Troubleshooting extensions and themes]] and [[Troubleshooting plugins]]
If it does work in Safe-mode then disable all your extensions and then try to find which is causing it by enabling one at a time until the problem reappears.
You can use "Disable all add-ons" on the [[Safe mode]] start window to disable all extensions.
You have to close and restart Firefox after each change via "File > Exit" (Mac: "Firefox > Quit"; Linux: "File > Quit")

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