I installed a number of 'other' speed dial extensions just now.
I was not satisfied with any of them.
Considering doing a rollback on Firefox to ver 54 when I figured I would give this extension ONE MORE TRY.
I installed it again and restarted my browser and it started working again. All the features came back but I lost my dials because I didn't do a back up.

I like that I can add groups.
I like that I can take a screenshot and set that as my image for the dial.
I like that I can drag and drop my dials.
I like that I can color code my groups.
I believe if there was a way to drag a page and drop it to a new dial this extension would be fantastic.

I don't know what caused the extension to fail.
I now know to back up my dials and I have synced them on the cloud too.
I sincerely hope this is the end of my speed dial frustration.
Now if someone could make a BBCode Xtra replacement I'd be happy with this new firefox.