What is MergeDocsOnline?

The Malwarebytes research team has determined that MergeDocsOnline is a browser NewTab. These so-called “NewTabs” can manipulate your browser(s), for example to change your startpage or searchscopes, so that the affected browser visits their site or one of their choice.

https://forums.malwarebytes.com/topic/204669-removal-instructions-for-mergedocsonline/