OMG! Thank you! I've been chasing my tail trying to figure this one out since yesterday. I downloaded the Firefox 3.1b3 yesterday to try their new "Weave" feature, and the two events (i.e. missing WB icons & new Firefox) seemed to coincide.
Having said that I did check the problem using my regular Firefox install and it was the same, but sometimes the Beta's can fiddle with your old settings, even tho' they claim not to.
@ 2of3 - re. Chocalate and link to previous post. Try sending a walnut whip...