Using the Lightbeam addon with Firefox 24.0 under Windows XP and Windows 7, the Lightbeam tab is always completely blank. It indicates in a top bar that I have visited x sites and y third party sites but there is no graph, no clock and no list of what those sites are.
I have found no information to cover this on the Mozilla site.
Is this common? Is there some configuration setting that I need to change?
I normally use Adblock Plus but I have removed that in case it was the problem. Removal made no difference.
EDIT - additional information
It appears that this is a very common problem: https://addons.mozilla.org/en-US/firefox/addon/lightbeam/reviews/