Let us check that. I will forward that to the developers. 

You also can use custom images for dials.

First, do this:
https://everhelper.me/fix-57.php

if it won't help, then

https://everhelper.me/help1.php  and  https://everhelper.me/help2.php

в будующих версиях мы добавим.

First, do this:
https://everhelper.me/fix-57.php

if it won't help, then

https://everhelper.me/help1.php  and  https://everhelper.me/help2.php

Please read this

https://everhelper.me/help2.php

First, do this:
https://everhelper.me/fix-57.php

if it won't help, then

https://everhelper.me/help1.php  and  https://everhelper.me/help2.php

Please note, we are upgrading FVD Speed Dial extension to New Firefox Legacy, otherwise, it will be soon automatically disabled. Besides new good improvements, the New legacy has its own limitations but we hope Firefox team will improve them soon.

First, do this:
https://everhelper.me/fix-57.php

if it won't help, then

https://everhelper.me/help1.php  and  https://everhelper.me/help2.php

First, do this:
https://everhelper.me/fix-57.php

if it won't help, then

https://everhelper.me/help1.php  and  https://everhelper.me/help2.php

BTW, if you didn't sent any background image, then you need to change color of the titles in the Speed Dial settings

Could you please post the screenshot?