Quick hard refresh can be done by using the following short cut keys
*Hold down Ctrl and press F5.
*Hold ⇧ Shift and click the Reload button. *Hold down ⌘ Cmd and ⇧ Shift key and then press R.
Mozilla Firefox and Related Browsers:
*Hold the Ctrl key and press the F5 key. *Hold down Ctrl and ⇧ Shift and then press R.
*Hold down the ⇧ Shift and click the Reload button. *Hold down ⌘ Cmd and ⇧ Shift and then press R.
*Hold the Ctrl key and press the F5 key. *Hold the Ctrl key and click the Refresh button.