I am using Firefox. I type Facebook.com into the address bar and wind up with webfetti. I type in gmail and wind up with webfetti. If I hit the back button the correct opening page will appear. How do I get rid of these hijackings?

You can start by download the free version of Malwarebytes.org. Boot into Safe Mode and install it and run it.

This did not resolve the issue. Any other suggestions?

remove webfetti - Google Search

Thank you NeedKarma. However, I have never knowingly installed Webfetti and it is not in my Add/Remove list. Neither is the toolbar that is mentioned in most of these Google solutions.

You've got yourself a nasty little infection. If you are comfortable getting into the guts of Windows you can try this: PC Hell: My Web Search Removal Instructions

Or else do a System Restore to a date before the malware infection.

I have the same problem... usually I can just type in "face" and hit enter and it takes me to Facebook... now it redirects me to another site!
It's frustrating.

I ran AVG, Malwarebytes and a rootkit scan thingy... none of them worked.

Thanks for the suggestion of system restore NK, I forgot about doing that.

One good one is called ComboFix. I have used it countless times to clean up computers. When malewarebytes fails, this usually does the trick.