Help!

I cannot edit my buttons on fast dial. I used to be able to hover over a button and get a bar that allowed me to edit or I could right click on a button and select properties. Neither of these options work. I have to open Firefox Bookmarks and organize bookmarks and then edit it there, but even then it doesn't refresh or change the picture.

I use a Mac with OSX and Firefox 3.0.3

Thanks for your help!