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.jsonlz4 backup file does not work

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Hi I had to reinstall W 10 and Firefox. My latest backup bookmark files have .jsonlz4 extensions. When I try to do a restore I get "Unable to process backup file" error. Thanks..

Hi I had to reinstall W 10 and Firefox. My latest backup bookmark files have .jsonlz4 extensions. When I try to do a restore I get "Unable to process backup file" error. Thanks..