Also, it looks like there is a later version of Safari, V14.0.3 (released on February 1st). Maybe upgrade to it and see if the message goes away.
I couldn't find a later version of Safari when I looked so perhaps the later Version goes with Big Sur which I don't have.
Have you done any installations at all recently? Nope.
And if the extension can be used with another browser, can you try that? [/quote] I may try that at a later date if I need to, thanks.