Regarding FF4, I've did a quick sanity check and did not find any error with FF4 so I updated the support version to 4.0.*
IMPORTANT: the "status-bar" (where lori displays the stats) is gone. The replacement, the add-on bar, is NOT enable by default. You will need to enable it. Use
View -> Toolbars -> Add-on Bar (check mark)
The View menu itself might be hidden by default, so you need to enable the View menu first. Sorry for all the hassle but these UI changes are not in my control.
Also, the number of request (req) looks wrong: always zero. I am not sure I will have time to look into that (will try). But from what I gather most people are interested only the timing anyway (the first two values) so probably is not a big lost.