To delete the cache on a Mac in the Firefox browser, please do the following:
To delete the cache with one click you can install extensions for Firefox.
*use at your own risk*
Empty Cache Button
Clear Cache Button
Clear Site Cache
More Extensions for Firefox
Use CleanMyMac X instead of doing the dull routine over and over again. It will notify you when it’s time to clean. All you need to do is click a single button.