Solved Suspicion of infection

[Thalrin]

And other browsers

 

[Broni]

Uninstall Firefox completely using this manual: http://kb.mozillazine.org/Uninstalling_Firefox
NOTE. Use MozBackup: http://mozbackup.jasnapaka.com/ to backup your bookmarks and passwords. Do NOT backup anything else.
Install fresh copy.

 

[Thalrin]

Well, after a full night of leaving FF open and multiple tabs pulled up, the problem has not occurred again. While I cannot be certain the conditions needed to replicate the issue, if there is no further incident, then there should be no further need to take up your time anymore. Thank you for the help. It is great to know there are places like this, and people willing to give up their time, to assist others.

 

[Broni]

Way to go!!
Good luck and stay safe