How to clear Mozilla Firefox Cache on Your PC

To get started head to the 3 horizontal lines at the top right corner of Mozilla Firefox Browser > Options. 

Next, click on Privacy option in the left menu.

Then choose clear your recent history option.

A small window will pop up on the screen, please make sure to have the Cookies option and Cache option checked. 

As for the Time range option, you can try Today option, if it doesn't work, please try Everything option.
Finally click on Clear Now button and reload the site afterwards.