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Install without a 2nd device

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I do everything I need through my smartphone. I therefore do not have a second device to add to my installation, and cannot complete the installation. How do I finalise my installation?

I do everything I need through my smartphone. I therefore do not have a second device to add to my installation, and cannot complete the installation. How do I finalise my installation?

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Installation is completed; this is just a suggestion to add a 2nd device.

Actually, there's no need nor sense to set up a Firefox Sync on only one device.

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The option of creating a Firefox account is optional as it is not required whether you use Firefox on one or multiple different devices.

What a Firefox Account is used for https://support.mozilla.org/en-US/kb/access-mozilla-services-firefox-account