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how do I change my main device?

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I bought a new computer and synced my firefox accounts but my old computer is still the main device... How do I change that?

I bought a new computer and synced my firefox accounts but my old computer is still the main device... How do I change that?

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There is no "main device". All desktop / laptop devices have equal permissions; "mobile" devices do have slightly less capabilities especially when it comes to bookmarks.

What are you trying to do that brings that question?