We can create a new skin or edit the current user skin to remove the time slider.
Below items xmlhandle the time slider.
<element name="timeSliderRail" src="timeSliderRail.png" />
<element name="timeSliderBuffer" src="timeSliderBuffer.png" />
<element name="timeSliderProgress" src="timeSliderProgress.png" />
<element name="timeSliderThumb" src="timeSliderThumb.png" />
We can change them according to our need.