First be sure you did this: Internet Explorer: Tools (from the menu bar) / Manage add-ons / Show All add-ons, then select the offender's, and click disable or remove.
Then do this
Open Internet Explorer, click on the “gear
icon” in
the upper right part of your browser, Or Tools
(from the menu bar) then click Internet
Options.
In the “Internet Options” dialog box, in the
"Tabs Change how webpages are displayed in tabs", section
click on the “Settings” button
then select your first home page