Did you try to download from server data ? (Careful with that one because it will override your local data). 

Check first if you have backups here:

I think it's in you firewall settings. There shouldn't be difference between connection in our Firefox or Chrome extensions.

Did you try to reinstall?

Hi,

Right Click in Speed Dial free space, Style > 3d

It will be updated soon. Version for Chrome is already available. 

Old Firefox version was discontinued. New one will be much better and has more features.

did you use this extension?

https://addons.mozilla.org/En-us/firefox/addon/fvd-synchronizer/

Do you mean bookmarks sync 

https://addons.mozilla.org/En-us/firefox/addon/fvd-synchronizer/?src=dp-dl-othersby

or you need Tabs sync?

Where exactly it happening? In FVDspeed dial search bar?

Hi. I believe that already responded on Mozilla. 

It will be updated soon and you will be able to sync between FF and Chrome.

Soon mobile app will come up to.

what kind of other extensions do you mean? Just links to any other extension?