doesn't show any preview, only blank fields

Hello! Can you send me screenshot of your Speed Dial? 

Hello! We need some info to help you:

OS version

Firefox version

Addon version

Backup of your dials

(create backup into file)

Hello!

Here is my info:

Win 7 sp1 x64

Tor Browser 7.5 (based on Mozilla Firefox 52.6.0) (32-bit)

Speed Dial [FVD] New Tab Page, 3D Wall, Sync 64.3.5

speeddial.sd