Firefax hangs in remote desktop when another user logs in on the console

When I work with remote desktop on a windows 7 pc I could always use firefox without any problem, even when someone else was logged in on the same windows 7 machine. Siince the update of firefox to version 13, ff hangs in the remote desktop session as soon as someone else logs in on the wndows 7 console.

To be specific, this problem occurs in a multiple concurrent user configuration (=hack), where the RDC user and console users are simultaneous users. Firefox will hang, using 50% of the CPU. As soon as the RDC user walks over to the console and switches to that user the hang is released. The behavior is new to v13 and is highly reproducible.
For more info on multiple concurrent users:
[http://www.missingremote.com/guide/how-enable-concurrent-sessions-windows-7-service-pack-1-rtm http://www.missingremote.com/guide/how-enable-concurrent-sessions-windows-7-service-pack-1-rtm]

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