Thanks for the link but I think the info is no longer on »
www.sillysot.com/other.htm .
In any case I have now fiddled with some of the FF settings in "Options" and updated Adblock+ and that seems to have eliminated the problem. Not sure what did it tho.
Edit:
BTW there is a block incorporated in Adblock+ (EASYLIST Filters) - namely: "/intellitext."