Rated 5 out of 5 stars
"Terry Doyle" Just right click on were it says install and save link as. save it to your desktop and just drag the downloaded xpi to your firefox screen and it will simply install for you! That problem sometimes happens to me with many addons, not sure why that happens but im pretty sure its nothing to do with the addon itself! Do what i suggested and you will find it will install straight away! Its worth it as this addon is just a great popup blocker.
Thanks for the fix for the updated adblock plus 1.3.1 Works like a charm again! Brilliant addon!