FireFox 4 Causing Desktop Windows Manager to crash

On two separate computers with multiple monitors it seems that when I open an second browsing Window on one of the other monitors I will get a warning under Windows 7 saying that video memory is low and color scheme will be reverted to Windows Basic.
This is under Windows 7 on both computers and both have fairly powerful video cards with one being a Radeon 4550HD and the othre being a Radeon 5770HD. I have the latest driver package running and this type of crash does not happen with Internet Explorer 8 or 9 or any other application on the computer.
The only common item both these computers have installed besides the Windows version and browser options is I have a desktop manager application called UltraMon installed and I am wondering if it is related to that. I am looking into a way to test this with UltraMon disabled to see if that is the common factor. Still doesn't change the fact that it only happens with Firefox.

I just received this problem with windows 7 x64 sp1+updates with no 3rd party desktop manager - just the windows 7 standard aero interface.

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