There is nobody getting tricked to download Firefox unless it is a Scam/Malware. Firefox auto updates unless you un-tick the box under Tools --> Options Or you Open the Help --> About and it will start or say Restart. I would think maybe you want to check : https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-caused-malware and https://www.malwarebytes.com/adwcleaner/ follow directions https://forums.malwarebytes.com/topic/9573-im-infected-what-do-i-do-now/ If was a real download It might have to be configured to work with your Network : https://developer.mozilla.org/en-US/Firefox/Enterprise_deployment You can download any version of Firefox you want : https://ftp.mozilla.org/pub/firefox/releases/ Please let us know if this solved your issue or if need further assistance.