You should update Firefox right now to fix a critical bug
 

If you have Firefox on your computer, you should update it right now. Mozilla has released security updates Firefox 67.0.3 and Firefox ESR 60.7.1 to fix a critical bug, which it says hackers are actively exploiting to take control of vulnerable syste...

https://www.engadget.com/2019/06/18/firefox-zero-day/