Sync Error Using Firefox Portable

Hello, I can't seem to complete a sync on Firefox portable without getting an error. This is a new installation, so a first time sync. However, though it is impossible to be sure, I believe all (at least most) of my data and files have transferred.

Error: Component returned failure code: 0x80004005 (NS_ERROR_FAILURE) [nsIFile.remove]

Report number: 1971859244

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