How do I keep a page as my home page when dragging icon to left of URL to house image & confirming that I want it as home page works only for current session, so when Firefox next opened, I end up with some stupid search page which McAfee doesn't like?

Question

A couple of days ago, I connected to the Internet as usual & opened Firefox, only to be greeted by an almost blank screen with a Google-type search box in the middle & this message from McAfee:
"Your default search settings have changed. This may pose a security risk. Would you like to restore them to McAfee Secure Search to provide a safer searching experience?"
instead of my usual home page (BT Yahoo). I naturally clicked on the "Yes" option in the message, but rather than restoring my BT Yahoo home page, all that did was to insert the McAfee logo to the left of the search box in the top right-hand corner of the screen. The first time it happened, I had to search for the BT Yahoo page & then followed the standard procedure for setting it again as my home page. It worked only for that session: each time I shut down Firefox or restarted my computer after that, all I got was the blank "search page" & restoring the previous session was the only way to get back to BY Yahoo. How on earth do I make the home page setting permanent?
As far as I'm aware, I have done nothing to alter my search settings. However, I am anything but computer-literate, so I may have done/pressed something without realising it, but trying to understand what is now happening is far beyond my limited IT skills.

Answer 1

See McAfee support to find out how to disable that McAfee feature - that isn't part of the normal Firefox installation.