Hi,

Update extension to the latest version:  62.8.5 or Higher
https://addons.mozilla.org/en-US/firefox/addon/fvd-speed-dial/

This is the simples option, not always help but we encourage to try. 

- Copy and paste in address bar about:support  
- Select following http://nimb.ws/Vm5pjy 
- Rename this folder to any name and restart Firefox http://nimb.ws/awxfuW BUT don't delete it. Just rename it, for example Storage_OLD

Here is VIDEO
http://nimb.ws/XrkKQ2

If it won't help, let us know.

Some of the cleaning extensions has option to clean Extensions' databases. You need to turn it of.

Thank you.

Latest speed dial version for FF has setting to change color of folders.

Так можно же убрать и 3D и всё лишнее

Здравствуйте
We launched update couple hours ago. Update extension to the latest version:  
https://addons.mozilla.org/en-US/firefox/addon/fvd-speed-dial/
 
попробуйте вот так
в адресбаре вставьте about:support
далее нажмите
http://nimb.ws/Vm5pjy
далее
http://nimb.ws/awxfuW
переименовать эту папку и перезапуститься.
Вот ВИДЕО
http://nimb.ws/XrkKQ2
Дайте знать если поможет или нет. 
В целом проблема связанная с этим https://everhelper.me/help1-ru.php  даже те, кто не понижал, у них всеравно такое бывает.

In speed dial settings or reinstall the extension

Change color of titles in speed dial settings

Would you like to make https://www.teamviewer.com with our developer? It is pretty quick, safe and free.
don't forget to mention this topic.
please contact us via team@nimbusweb.co
Thank you. 

Firefox doesn't allow it anymore. You need to your own image.

You need to upgrade to FF57+