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After migrating over all my data to a new iMac, Firefox thinks the old iMac and the new iMac are the same device.

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I just got a new iMac, but will still use the old iMac, too. I used "Migration Assistant" to move all my data from the old to the new computer. Now Firefox sees only one device, instead of too. Does this matter?

I just got a new iMac, but will still use the old iMac, too. I used "Migration Assistant" to move all my data from the old to the new computer. Now Firefox sees only one device, instead of too. Does this matter?

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You should be able to edit the name of your device. Go to about:preferences#sync, and then click "Change Device Name" to edit the name.