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What are the "bookmarkTools.dupBm160" (many entries) in about:config and how can they be removed if not needed?

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In about:config I noted MANY entries that start with: bookmarkTools.dupBm What are they? What purpose do they serve? How to get rid of them if they serve no purpose?

In about:config I noted MANY entries that start with: bookmarkTools.dupBm What are they? What purpose do they serve? How to get rid of them if they serve no purpose?

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Probably added by an extension.

Help > Troubleshooting Information... Copy and paste that info into the reply box.