Weird popup in Firefox on just one site: "Fail to write content/metadata."

[NMONNET <nico altiva fr>]

I get this on this site: http://sysadmin.wikia.com/wiki/Main_Page

A javascript alert pops up:

==8<------------------------------------
[Javascript Application]

Fail to write content/metadata.
 Would you like to disable beagle now ?
==8<------------------------------------

Beagle works fine otherwise. Nothing shows up in logs or anywhere as far 
as I can tell; nothing weird in the various Mozilla logs. 

This shows up even on a fresh profile, with no FF extension but this one.

Tried SELinux on/off, no diff.

This is on F10, FF 3.0.4, beagle-0.3.8-13.fc10.x86_64, beagle-
firefox-0.3.8-13.fc10.x86_64

(Thanks