Hello,

You can probably import your old dials. If you have your .speeddial
backup file, just import it. Here is a short tutorial:
https://www.youtube.com/watch?v=1qGPxWgazJk

If you don't have your backup file, you can look for one here:
C:\Users\\AppData\Roaming\Mozilla\Firefox\Profiles\\SDBackups
and look for .speeddial files.

You can also download Firefox ESR and backup your dials. However
downgrading to Firefox ESR will break your Firefox database and you will
have to use Firefox reset feature to fix it afterwards
(https://support.mozilla.org/en-US/kb/refresh-firefox-reset-add-ons-and-settings).

I hope this helps :)

Best regards,

Juraj Mäsiar