have a look at Group Speed Dial, the developer is very fast to release updates and take suggestions on what to do.  

when they actually do release it, instead of lie you will find it here https://addons.mozilla.org/en-US/firefox/addon/fvd-speed-dial/  previous versions are here https://addons.mozilla.org/en-US/firefox/addon/fvd-speed-dial/versions/

don't hold your breathe.  I asked them a while ago and it was meant to be released last week.  They seem to lie about its release.   have a look around firefox addon's there is a better extension to this