Type about:addons<enter> in the address bar to open your Add-ons Manager. Hot key; (<Control> [Mac=<Command>] <Shift> A)

In the Add-ons Manager, on the left, select Extensions. Remove “ Bing “ Anything.

Also remove SafeSearch, SearchAssist Incognito, FileConverter Addon, SearchLock, DiscreteSearch, WebSearch, Findwide Search Engine, securedsearch

Now do the same in the computer’s Programs Folder.

Windows: Start > Control Panel > Uninstall Programs. Mac: Open the Applications folder. Linux: Check your user manual.

Thanks for the reply. That will stop it from happening on further updates? And even if so, why does Firefox even have any need to change MY choice of search engines on an update?

Actually, none of the things that you suggested removing were there. Any further thoughts?

I don't think Bing is the default anywhere in the world. However, if your default search engine is deleted or disabled, then potentially Firefox will fail over to the next one. Are other search engines being removed during updates?

Also, I think support has ended for Firefox 60.

I'm using 60.6.2esr . I thought it was updating, but looking at the history, it shows that it hasn't updated since 6 May 2019. Unfortunately, I just clicked on the "check for updates" and it downloaded an update. I remeber now why I went back to 60. The current version slowed down my PC incredibly. I'll see how this works now, if noy good, I'll revert to 60 again and keep migrating everything to Brave. BTW, the only search engine I keep reverting to (in Firefox selections) is DuckDuckGo. Thanks!