[Greasemonkey] fails in Firefox/Ubuntu

[Nikolas Coukouma]

larytet.15770275 at bloglines.com wrote:
> when i try to add JS first time (menu Tools/New User Script) firefox opens
> dialog and let to choose JS file. after i click Ok firefox does not respond
> with any additional messages. The script does not appear in the Manage User
> Scripts. When i try to add the script file again i see the following error
> on JS console
>
> XML Parsing Error: no element found
> Location: jar:resource:///chrome/toolkit.jar!/content/mozapps/update/updates.xml
>
> Line Number 1, Column 1:
>
> Firefox does not open any dialogs on the consequent
> attempts to add user scripts.
>
> I tried both HelloWorld from the tutorial
> and Butler. 
>
> i am running Firefox Mozilla/5.0 (X11; U; Linux i686; en-US;
> rv:1.7.10) Gecko/20050721 Firefox/1.0.6 (Ubuntu package 1.0.6)
>
>
> thank
> you
>   
The XML parse error suggests that your Firefox installation is a bit 
corrupt. I recommend reinstalling Firefox.

I why don't know why updates.xml would be involved ...