FireFox 8 won't run for 2 users at once on Windows 7 after update

Firefox did an automatic update a few days ago. Since that update, if I login to my Win7 PC as me and have FF running, my wife cannot login with her account and run FF - it says FF is already running. Prior to the update, we could each run FF at the same time and switch between users with fast user switching. FF is the only app I have right now that is not working this way.
What happened to multi-user support ?

Check that Firefox isn't set to run as Administrator.
Right-click the Firefox desktop shortcut and choose "Properties".
Make sure that all items are deselected in the "Compatibility" tab of the Properties window.
* Privilege Level: "Run this program as Administrator" should not be selected
* "Run this program in compatibility mode for:" should not be selected
Also check the Properties of the firefox.exe program in the Firefox program folder (C:\Program Files\Mozilla Firefox\).

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