I see two parts to OP’s question in the title. The first part is installing the extensions and the second part is configuring them. Firefox Sync will automatically install your extensions on a new device, but in the extensions that I’ve tested, the extension settings will not carry over.
I see two parts to OP’s question in the title. The first part is installing the extensions and the second part is configuring them. Firefox Sync will automatically install your extensions on a new device, but in the extensions that I’ve tested, the extension settings will not carry over.