Firefox has lost my Bookmarks

  JJRFAN 19:54 13 Apr 2018
Locked

Recently Mozilla Firefox updated on my desktop PC (MS Windows 10 Home 64-bit) and afterwards all my Bookmarks were missing. I had a lot of Bookmarks, collated over many years. Is there anyway I can get them back?

Please make any advice straightforward and idiot proof: I would rate my IT skills at pre-novice.

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