I was using Opera and loved their Speed Dial. I missed it so much when I switched to Firefox. I found Speed Dial[FVD] and a couple of others that were similar. I tried them all, and decided Speed Dial [FVD] was the closest to Opera's version, and I have been happily using it, without any issues, for almost two months. I would actually give it 4.5 stars instead of 5, because there is always room for improvement. All in all, great add-on.