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Old bookmarks 'recovered' to external drive. Failing to import file '.jsonlz4' to new machine and new installation of F'fox 53.0.3 64-bit

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Hello. Following an HDD failure - or Win 10 - I had a techie recover what he could onto an external drive/folder 'Old Firefox Data'. Within this < C:\Users\oldbilbo\Desktop\Old Firefox Data\oix6g95j.default\bookmarkbackups > is a series of files each designated .jsonlz4 which presumably contains the required bookmarks.

I've tried and failed to import via 'Show all bookmarks - Import and Backup - Restore - Choose file - chosen date', with nothing imported.

Can anyone suggest an effective solution?

Hello. Following an HDD failure - or Win 10 - I had a techie recover what he could onto an external drive/folder 'Old Firefox Data'. Within this < C:\Users\oldbilbo\Desktop\Old Firefox Data\oix6g95j.default\bookmarkbackups > is a series of files each designated .jsonlz4 which presumably contains the required bookmarks. I've tried and failed to import via 'Show all bookmarks - Import and Backup - Restore - Choose file - chosen date', with nothing imported. Can anyone suggest an effective solution?

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You can try to rename/remove all places.sqlite files in the profile folder to see if that makes importing work. If you would place one compressed .jsonlz4 backup in the bookmarkbackups folder then Firefox will try to rebuild the bookmarks from this backup if you remove places.sqlite.