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How do I incooperate my old version of fire fox into the new version?

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When changing over hard drives, I had to install the new version of fire fox. How do I bring in the old version from the other hard drive?

When changing over hard drives, I had to install the new version of fire fox. How do I bring in the old version from the other hard drive?

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How old the that "old version"?

Are referring to your data - bookmarks, passwords, and the like? https://support.mozilla.org/en-US/kb/recovering-important-data-from-an-old-profile