This site among a HOST of others have plagued Firefox to the point where I can’t use it. Avast does not detect a single one of these culprits and I’m at a loss. The site: http://www-mysearch.com/?prd=set_epc&s=G3NzFTPTN095001,5784eb48-b6ba-44dc-ac3d-0d41073079b0
follow instructions here https://forum.avast.com/index.php?topic=53253.0
we need Malwarebytes and Farbar Recovery Scan Tool logs, attach the logs, 3 logs total
see below the box you write in … Attachments and other options
When done a expert will check logs and assist you