Often this is caused by an add-on, particularly an extension. You may want to reset your home page, then review your extensions on the following page and disable ALL nonessential extensions. orange Firefox button ''or'' classic Tools menu > Add-ons > Extensions category After restarting Firefox, did your change stick? Related questions with additional suggestions: * [https://support.mozilla.org/en-US/questions/937750 Why doesn't Firefox have a way to uninstall Snap.do and all the Malware it puts in a person's computer?] * [https://support.mozilla.org/en-US/questions/935556 Snapdo] * [https://support.mozilla.org/en-US/questions/937498 Something called Snap.do has hijacked my browser. How do I get rid of it?]