Nice! I've been looking for an Opera-like speed-dial for Firefox: Simple, static dials with dial folders. This is very close!

I like that it is connected to bookmarks, making synchronization easy. I also like the folders - and that the folder image is replaced with an image of the folder contents when I update it.

What I don't like is that it seems to take a bit of effort to edit the speed dial. As far as I can see, the only way I'm able to change the dial images from (alas, quite ugly) screenshots of the pages, is to add url's to the images I'd like to replace them with. That's a lot of time and effort spent changing dials... I'd wish that the icons that the Bookmarks have in Firefox could be used (or something like that), rather than screenshots.

I also miss Android support (I synchronize), but I see in former comments that this is not happening.

I'm really hoping for development on this addon, though! It looks very promising!