Firefox will not allow me to close tabs or drag them to a new window.

I can't close individual tabs. I -CAN- close the entire application, but I don't want that. Also, the Close Tab entry is missing from the File menu.
Is there some feature in FF that allows a site to disable turning off separate tabs? Is this an exploit that certain pages are using? Or...is this an actual bug?

Yes. I used Safe mode. The problem only occurs when I am using Facebook, apparently; some scripts loaded by Facebook seem to interfere with one or more scripts in "tabbrowser.xml".
Specifically, the error is reported to be in this line:
Script: chrome://browser/content/tabbrowser.xml:1644
I can often stop the scripts from Facebook, and then the tabs can still close; but if I stop TabBrowser.xml, tabs will no longer close. Unfortunately, when the FB scripts crash, I usually have little choice but to close the TabBrowser.xml script.
This now happens constantly while I use Firefox on Facebook. It no longer happens unless I am using Facebook, and is apparently unrelated to whether I play Farmville.

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