Firefox 12.0 will not open on 2nd display by default

I just upgraded to Firefox 12.0. I have a second monitor connected to my MacBook Pro. With Firefox 11 and all previous versions, I had it set up that Firefox would automatically open on the second monitor when I open the program. With Firefox 12, it absolutely will '''not''' do this any longer. It's extremely annoying and makes me want to switch to Safari or Chrome, both of which do correctly open on the 2nd monitor.
Here's what I tried:
-Resizing the window and moving it to the second display, then quitting the program and reopening it.
-Moving the window to the second display and maximizing it, then quitting the program and reopening it.
-Uninstalling Firefox and deleting ALL files (including those in the Library Application Support and Preferences folders), then reinstalling version 12.0
-Uninstalling Firefox and deleting ALL files (including those in the Library Application Support and Preferences folders), then reinstalling version 13.0b
-Uninstalling Firefox and deleting ALL files (including those in the Library Application Support and Preferences folders), then running disk utility to repair permissions and disk, THEN reinstalling version 12.0.
What will correct the problem (though not a solution):
-Uninstalling Firefox and deleting ALL files (including those in the Library Application Support and Preferences folders), then reverting back to reinstalling version 11 and turning off the automatic updates.
The tech specs:
MacBook Pro 15" 2.66 GHz Intel Core i7, 8 GB 1067 MHz DDR3
Mac OS X Lion 10.7.3 (11D50)
Intel HD Graphics:
Chipset Model: Intel HD Graphics
Type: GPU
Bus: Built-In
VRAM (Total): 288 MB
Vendor: Intel (0x8086)
Device ID: 0x0046
Revision ID: 0x0018
gMux Version: 1.9.21
NVIDIA GeForce GT 330M:
Chipset Model: NVIDIA GeForce GT 330M
Type: GPU
Bus: PCIe
PCIe Lane Width: x16
VRAM (Total): 512 MB
Vendor: NVIDIA (0x10de)
Device ID: 0x0a29
Revision ID: 0x00a2
ROM Revision: 3560
gMux Version: 1.9.21
Displays:
Color LCD:
Resolution: 1440 x 900
Pixel Depth: 32-Bit Color (ARGB8888)
Main Display: Yes
Mirror: Off
Online: Yes
Built-In: Yes
Sharp LL-191A-B:
Resolution: 1280 x 1024 @ 75 Hz
Pixel Depth: 32-Bit Color (ARGB8888)
Display Serial Number: 4H065468
Mirror: Off
Online: Yes
Rotation: Supported
Adapter Type: Apple Mini DisplayPort To VGA Adapter
Adapter Firmware Version: 1.03

Just like Scott, dno_bot...and the many others across Google that are experiencing this same problem.
Previous versions behaved properly - Version 12.0 has a bug! hopefully it is fixed before they lose users to the likes of Chrome, Safari, IE, Aurora, Opera, etc, etc. There is a reason we chose Firefox, and there could be a reason why we chose to delete it????

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