Firefox - visited links

hi,

the visited links in firefox for U3 don't get the colors defined - they're always as never visited. is this a known problem, or is there something wrong with my installation. i even deactivated every plugin, but to no use.

*) firefox for U3 1.5.0.43
*) firefox 1.5.0.6
*) Hama USB-Stick 2GB U3

options:

"let the site decide the colors" or "use defined colors above" - nothing works.

thx, bye
chris