Speed Dial is one fantastic extension! I have 33 on my Firefox but, without question, this is by far my favorite. In 24 groups I have 641 dials. It's simply the best of its genre. No other speed dial extension comes close. The developer, Juraj Masiar, is very actively working on this extension. Should you have a problem with Group Speed Dial he is right there to help you. Look for this extension to get better and better!