Using Google Nexus 4, No Option to Delete History, Only Priv. Data?

Using the above phone and the most up-to date version of firefox mobile for android (Ver. 21.0), In the settings it only has the option to Delete Private Data and is unlike the videos i have seen where it also has the option to delete history (just above). Deleting everything from the Private Data does not remove my history. So how do I remove my history? My android version is 4.2.2., Firefox Version 21.0 & the phone is a Google Nexus 4.

Thank you

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