thank you power for the detective work and admin for fixing this bug!
I was quite annoyed by this and didn't know why some pages suddenly looked so strange, until I noticed the update of no-script and now everything is fine again

Mozilla/5.0 (Windows; U; Windows NT 5.1; de; rv:1.9.0.17) Gecko/2009122116 Firefox/3.0.17 (.NET CLR 3.5.30729)