Yesterday, after installing Firefox 3.6, upon accessing the Wall Street Journal web page, at once got warning that BD had blocked trojan.JS.PYW.
Firefox discussion group had suggestions, which did not fix this. The problem did not appear with Firefox 3.5, or with Internet Explorer.
I removed 3.6, and put back 3.5.8, problem has not re-occurred.
Any thoughts on what is going on here?