Dear Mozilla,

                      Lightbeam is installed on my computer and sometimes it can list 600 or more sites. That seems to be as far as it gets and then it resets and completely clears itself. Now I usually only visit up to 20 sites on a regular basis and when I start again I visit about 10 of them in quick succession and then block all of the sites that appear on Lightbeam. About 250 will appear almost straight away and it is quicker to unblock those that I view. I find that the download speeds increase when Lightbeam is fitted, and it was the slowness of pages to load which prompted me to install Lightbeam anyway. After 4 or 5 days the number of sites on Lightbeam will rise to 500 and it will reset before the week is out. The only people who use this computer is my Wife and I and neither of us are experts and we don't do things like go into command line interface!

Yours sincerely, Thomas Kavanagh