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how do I log into Firefox without syncing it to another device

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everytime I try to login it tells me to sync it to another device I don't want to sync it to another device I only want to use it on one how do I do that

everytime I try to login it tells me to sync it to another device I don't want to sync it to another device I only want to use it on one how do I do that

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Account android support android10.5