Turn off browsing history and bookmark suggestions in the location bar won't stick

I have followed all of the recommendations for trying to turn off browing suggestions and history but every time I re-open Firefox, the old settings return. I do not want History or Bookmarks to be suggested in my Location bar and in Tools:Options:Privacy I make all the changes according to the Help Articles I have read, but it still doesn't fix it. I have also tried clearing my cache, clearing history, etc. Please help, or perhaps this is an unfixable bug?

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