Always get '1 new add-on has been installed' when launching FF

Hi, I think an incompletely installed add-on may be causing the 'Add-ons' window to always be displayed when FF launches.
- FEBE extensions backup warns about one it can't process, and hangs.
'Could not process extension/theme with GUID {DDC359D1-844A-42a7-9AA1-88A850A938A8}(133) -- skipped'
(Note this does not seem to be in the registry)
This seemed to occur after I updated to FF 3.6.16
How can I identify the culprit? Thanks!

Eventually I came across a couple of posts where people have experienced this.
Creating a new profile corrects it, but you'd be wise to use the FEBE add-on to do a backup so you can rebuild your profile more easily.
Actually I had also tried FF4, then reverted.
It seems that installing FF4 can cause this problem, so some people may need to be beware of this.

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