There used to be several DNS flushing add-ons prior to Firefox Quantum. Are any currently available? Is this no longer something that's accessible through the addon API?
Yes, I realize that I can do this through:
Options/Preferences → Privacy & Security → Scroll down to History → Click "Clear History" → Set Time Range to "Today" → Deselect everything except "Cache" → Click "Clear Now"
but this is slow and cumbersome and would be better done through a clickable button.
Thank you for any suggestions!