We launched update couple hours ago. Update extension to the latest version: 62.6.7https://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
If it won't help, let us know.
Customer support service by UserEcho