Conficker warning when starting to look for addon-updates

I'm using the program Peerblock to watch and restrict in- and outgoing
requests to my PC.
Always when I start to look for addon-updates (either with Firefox
3.0.17 and with Firefox portable 3.6)
Peerblock gives me the following warning:
W32.Downadup.Conficker - conficker.info
and that my PC tried to contact the ip 81.88.40.52

the update runs fine, although the connection to 81.88.40.52 is
blocked by Peerblock.
Regarding to [url]http://www.sitelogr.com/s/exxtasy.de[/url] this ip belongs to
the website exxtasy.de which I doubt to be an official site of
mozilla.

Anyone got any idea, beside the obvious one that I will do several
conficker-tests and try some conficker removal tools. No matter its
weird that it always only starts when I hit on the addon-update button.

>[color=blue]
> ??[url]http://www.db.ripe.net/whois?form_type=simple&full_query_string=&sear[/url]...
>
> go tohttp://four.cs.uni-bonn.de/wg/cs/applications/containing-conficker/http://www.confickerworkinggroup.org/wiki/http://www.heise.de/security/artikel/Die-Infoseite-zu-Conficker-27012...[url]http://net.cs.uni-bonn.de/fileadmin/user_upload/leder/cfdetector/http://www.eeye.com/Downloads/Security-Tools/Conficker-Worm-Scanning-...http://www.bdtools.net/[/url]
>
> good luck![/color]

None of the online-checking-sites says I am infected. All say no sign
of infection. I already tested before posting, but rested again with
all your links. Still even if I am infected its strange to only be
when I hit update addons in any of my used firefox versions.