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How can I use my synched account on another PC?

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Hello I've synced my PC's firefox on my account but I have no access to that synced data because my domain has been changed. How can I use the data on that synced account on my new domain and firefox?

Hello I've synced my PC's firefox on my account but I have no access to that synced data because my domain has been changed. How can I use the data on that synced account on my new domain and firefox?

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If you can't receive and respond to an email from the Sync accounts / Firefox Account server there is no way to get data out of Sync. But your "data" is still on the devices that you had connected to Sync.

Setup a new Firefox Account with a current email address from your most used device. Then connect your other devices, along with the new device.

https://accounts.firefox.com/settings