In "Clear Browser Cache" step - "ClearHistory" in Firefox 51.0 gives an exception:

'Fail' : 2. Clear Browser Cache
------------------------------------------------------------
Failure Information: 
~~~~~~~~~~~~~~~
ExecuteCommand failed!
InError set by the client. Client Error:
mozCommandProcessor: TypeError: historyService.removeVisitsByTimeframe is not a function
BrowserCommand (Type:'Action',Info:'NotSet',Action:'ClearHistory',Target:'null',Data:'',ClientId:'3b7db3a3-9faf-4680-aa85-6d8d25824bbf',HasFrames:'False',FramesInfo:'',TargetFrameIndex:'-1',InError:'True',Response:'mozCommandProcessor: TypeError: historyService.removeVisitsByTimeframe is not a function')
InnerException: none.

InnerException:
ArtOfTest.WebAii.Exceptions.ExecuteCommandException: ExecuteCommand failed!
InError set by the client. Client Error:
mozCommandProcessor: TypeError: historyService.removeVisitsByTimeframe is not a function
BrowserCommand (Type:'Action',Info:'NotSet',Action:'ClearHistory',Target:'null',Data:'',ClientId:'3b7db3a3-9faf-4680-aa85-6d8d25824bbf',HasFrames:'False',FramesInfo:'',TargetFrameIndex:'-1',InError:'True',Response:'mozCommandProcessor: TypeError: historyService.removeVisitsByTimeframe is not a function')
InnerException: none.

   at ArtOfTest.WebAii.Core.Browser.ExecuteCommandInternal(BrowserCommand request)
   at ArtOfTest.WebAii.Core.Browser.ExecuteCommand(BrowserCommand request, Boolean performDomRefresh, Boolean waitUntilReady)
   at ArtOfTest.WebAii.Core.Browser.ExecuteCommand(BrowserCommand request)
   at ArtOfTest.WebAii.BrowserSpecialized.Firefox.FireFoxActions.ClearCache(BrowserCacheType type)
   at ArtOfTest.WebAii.Design.IntrinsicTranslators.Descriptors.ClearCookiesActionDescriptor.Execute(Browser browser)
   at ArtOfTest.WebAii.Design.Extensibility.HtmlActionDescriptor.Execute(IAutomationHost autoHost)
   at ArtOfTest.WebAii.Design.Execution.ExecutionEngine.ExecuteStep(Int32 order)