Updating Safari on iMac 10.15

Go to the App Store ad see if you can download and run the Safari Technology Preview releases 102 or 119 app. It may be like Safari and won't run on El Capitan. Worth a try, thought. If not give Brave a try. It's Chrome without the Google overhead. It's safe and fast. look on Brave's site for version 1.69x for Catlina. Do the same for Firefox 115 ESR which is compatible with Catalina.

There isn't one for Catalina. You could try Firefox ESR

You can't update Safari to a newer version than what's installed in Monterey.

FWIW, macOS 10.15 is Catalina.

Just to add, Safari Technology Preview is not in the App Store and requires macOS Sonoma or later.

Yes I know.

Assuming you mean downloaded, there are apps for Macs, iPhones and iPads.

… the gist of the conversation seems to indicate that for Catalina, I have to ditch Safari and download Firefox — right?

Not necessarily. Old Toad suggested Brave and so would I. Not that there's anything wrong with Firefox either.

Okay. This confused me…"It may be like Safari and won't run on El Capitan.".

Actually what was being said is Firefox ESR may work. :)

Brave is a good choice. The problem is it requires macOS 11 Big Sur or later.