I recently installed an update to Firefox, version 95 and it has changed my default search engine to Yahoo. I would like to go back to Google but the browser now only offers Yahoo. Duckduckgo or Startpage. Google is nowhere to be found and reverting to Firefox version 94 has had no effect.

Expert help wanted please.

Firefox didn't change your search engine settings.

Check for installed extensions that could have caused this.

I'm on 95.0.2 and nothing has happened to my search settings.  Google is still available for me so I don't think the update is to blame.  These are the choices I get:

 

Go to Firefox Settings -> Search -> Default Search Engine

I finally found it. As Treetops predicted, it was not Firefox at fault. In amongst the bundle of updates that I installed, was an update for my Linux Mint OS, Linux does not like Google because it does not share revenue with it.

At the bottom of the Search Shortcuts  is "find more search engines", I did not scroll down far enough to see it.

This took me to Linux and I found Google at the bottom amongst many others.

Thank you all for your advice.

I use DDGGI

I did fix my laptop and it is working OK now but I lost my spell checker any ideas ?

I've been using FF for a loooong time.  Yeah, I add and remove extension now and then.  This can result in pieces of something removed to remain in the profile and mess things up.

I try to fix it.  But instead of dedicating a lot of time to it I'll do a clean install with a brand spanking new profile. 

Archive the bookmarks and passwords, make a list of your extensions (there are extensions to help with all these chores).  It's a bother, yeah, happens maybe once a year.  I have a few things to avert tracking, block sites etc and sometimes these things need to be reviewed and re-evaluated anyway.  Happens about once a year or so.