There are a number of add-ons for Firefox that clone Opera’s Speed Dial feature. There is one add-on with a different twist. Most open your tabs in this fashion, but Fast Dial does something different.
This extension will replace your “about:blank” page with a panel of thumbnails of your favorite web sites. To add sites to the page, all you do is click on an empty cell, assign a URL and click OK.
You can also add sites by right-clicking on the bookmark for them and selecting “Add to Fast Dial”. (you can do this on open tabs too!)
Where does this come in handy? Well let us say you are hitting Ctrl+T to open a new window. You are no longer greeted by an empty window. Instead you have a window with your own personal favorites list inside. Fast Dial is a unique bookmarking extension that I think a lot of people will get a lot of use out of.