Hi everyone. We are the extension author, and we are working on the fix for this issue. I am trying to assign the bug to ourselves, but I can't get the right permissions for that yet. We'll update the bug with more info once we have news ;) Thanks for the report.
Fixed with the latest update of the add-on, on 2008-10-28
The bug for the specified add-on (Glubble) was fixed today (2008-10-28), with xpi version number 184.108.40.206. The xpi update was submitted to AMO, and it is already approved. The specific root cause of this error was a top toolbar the extension usd to add to the browser on top of the navigation toolbar. That toolbar was removed, as well as a lot of code related to it. In particular, removing that code fixed the bug ;) Cheers.
Thank you for the quick response to this issue Glaxstar.