system
3
I do not know if this can help you but I was in the same situation when I upgraded FF28 to 29. A black a for AOS icon and the " Option or Setting " site could not be reached. Just a about:blank page.
What I did was to reinstall FF29. Activated AOS first and then reboot the comp, not just FF, but the computer. Now I have my big green a again and I can set it up as I like it.