Since you have already deleted the possible bad apps what I would do is - 1. download & run malwarebytes. Your problem is not a virus and antivirus apps will not do any good.
2. download & run addons detector. The app is confusing so click on "help" - top right & follow directions.
3.If problem still exists then go to malwarebytes forum; they can probably help. They have a "strict" policy, so be sure & read instructions for new members & follow the instructions if you decide to post question; you can also posibly find solution by reading other posts