Update creates a pop up that frustrates highlighting and copying text

[CustomerMichael]

Just updated my Firefox and when I highlighted text, I got a pop up window that says "Search Google for...  I could not highlight and copy the text when I right clicked.  AI tells me this is an "experimental" feature and I am a test subject.  For heaven's sake, test it on your own staff before you foist this frustrating bug on your customers.  I had to go into settings to disable it.  AI told me how to do it, not Firefox.  Thanks for nothing.  And stop using me as a guinea pig. This is the second time, this has happened.  Get your act together before adding crippling add-ons. This headlong rush to compete with other browsers is not doing your reputation any good.

[dftf]

@CustomerMichael : type about:preferences#permissionsData in the URL bar, then press ENTER
Scroll-down to the bottom
Un-tick "Allow Firefox to run feature studies" to opt-out of this type of experimental feature testing

[CustomerMichael]

It was already unclicked, so why am I getting the pop up?

[dftf]

Type about:studies into the URL bar, then press ENTER
Does anything on that screen refer to search or Google?

If not, do you have an extension that might be causing this?
Menu -> Extensions and Themes -> Extensions.
Have you maybe installed any Google software (Chrome, Earth, Drive, etc.) and it might have added an add-on into Firefox you weren't aware of?