>Hi Sergey,
>
>I have had recurring issues - blankings...- on the UT with FF as well for a while (and stopped using FF specifically for the UT at that time - moving to Opera for a while. No I do want to side with googgle and/or MS monopolist browsers. I like market choice).
>
>In the end, I discovered the behaviour would relate to a recent combination of "adblock plus"+FF+UT. Do not ask which one ? What messy JS did lock up. I do not care. I disabled it for the UT and voilà, it now works as in the past!

The problem was with UT. Michel fixed it and UT works fine in FF with AdBlock Plus enabled.