i have downloaded my first video successfully, but when I have tried to download the next suggested video & opened it in the same tab of Firefox I find no downloadable item it shows the first video even though I am trying to download the second video.
This problem was resolved when i refreshed the page. i think it does not support the YouTube's Ajax Feature (Without loading the whole page loading just the content that is required).
OK, i know you all know what Ajax means, i just stated that so that you can understand my problem.
Finally I want to Thank the developer who have created this add-on for all of us.
Customer support service by UserEcho