Restore Bookmarks from old FF back-up?

I updated my OS to Ubuntu 12.04 and now have the lastest Firefox (WindBlows crashed & had to). I have old FF back-ups of my bookmarks (bookmarks...json), which are paramount to my business. When I follow the restore instructions here I don't get any restore options in the history library. I'm not a techy, please help in the simplest terms.

Thank you for a great product and your help.

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