That needs to be deleted if it is in the list of search engines. You may have added that by accident when you were at that site to the VERY Tiny pull down list on the right side of the Search Icon. Please look in the list of search engines and to remove it if it is there by clicking Change Search Settings. or Please Copy/Paste about:preferences#search into the Address Bar then Enter. Please look in the list of search engines and to remove it if it is there. Or Please use more than 1 scanner as each uses diff tech : https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-caused-malware Save your Report and google each before deleting anything as do not want to delete something you need, If need help : https://forums.malwarebytes.com/topic/9573-im-infected-what-do-i-do-now/ Post in only 1 forum, then wait.

Please let us know if this solved your issue or if need further assistance.

If the unwanted site does not show up on the Search page, I would suspect an extension. You can view, disable, and often remove unwanted or unknown extensions on the Add-ons page. Either:

• Ctrl+Shift+a (Mac: Command+Shift+a)
• "3-bar" menu button (or Tools menu) > Add-ons
• type or paste about:addons in the address bar and press Enter/Return

In the left column of the Add-ons page, click Extensions. Then cast a critical eye over the list on the right side. Any system extensions that Firefox installs on its own are hidden from this page, so everything listed here is your choice (and your responsibility) to manage. Anything that mentions search or looks suspicious? If in doubt, disable (or remove).

Any improvement?