The following exception is thrown: ExecuteCommand failed! InError set by the client. Client Error: mozCommandProcessor: A DOM click on the target element threw an error. TagName: STRONG Err: TypeError: Value does not implement interface WindowProxy. BrowserCommand (Type:'Action',Info:'NotSet',Action:'Click',Target:'ElementId (tagName: 'strong',occurrenceIndex: '0')',Data:'',ClientId:'b6944613-9e7c-4bed-bb32-826584199e37',HasFrames:'False',FramesInfo:'',TargetFrameIndex:'-1',InError:'True',Response:'mozCommandProcessor: A DOM click on the target element threw an error. TagName: STRONG Err: TypeError: Value does not implement interface WindowProxy.') InnerException: none.