I see this bug with a new profile with no extensions in:
Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.0.12pre) Gecko/2009052004 GranParadiso/3.0.12pre,
but not in:
Mozilla/5.0 (X11; U; Linux i686; eo; rv:1.9.1b5pre) Gecko/20090520 Shiretoko/3.5b5pre
Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.2a1pre) Gecko/20090520 Minefield/3.6a1pre
I see this bug with a new profile with no extensions in: 3.0.12pre,
Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.0.12pre) Gecko/2009052004 GranParadiso/
but not in:
Mozilla/5.0 (X11; U; Linux i686; eo; rv:1.9.1b5pre) Gecko/20090520 Shiretoko/3.5b5pre
Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.2a1pre) Gecko/20090520 Minefield/3.6a1pre