Google Toolbar for Firefox

[sc0ri0n]

Today, I wanted try the new Google Toolbar for Firefox (1.0.20050707)
and encountered a strange issue.  Once the extension was installed, I
restarted the firefox (1.0.4).  To my surprise, Google toolbar agreement
language came up in German instead of English. I guessed the OK button
and clicked it. Then, all menus in firefox changed to German.  I got a
screenshot here at my blog:
http://sc0ri0n.blogspot.com/2005/07/problem-with-google-toolbar-for.html

As soon as I removed the extension and restarted the Firefox, menus
reverted back to English.

I googled it but could not find anything related to the issue. Did
anyone try to install it on FC4?

Thanks,
Adil