Nope, 
http://roachfiend.com/archives/2005/03/03/allow-right-click/  doesn't work.
quote:
It's possible that the extension Session Saver is not completely compatible with the version of firefox you are using. I would suggest your reporting this problem to the developer of this extension, given the fact that the closing tab feature works correctly ( ? ) when the extension is not installed.
Yes, it does work when I don't have the sessionsaver plugin installed. I don't know how to report the problem to the developer. 
Edit Done 
