can I use another web browser beside Safari

There is a SeaMonkey (mozilla build) 2.49.1 that works in El Capitan 10.11.6

that allows you an email client and web browsing capabilities. It has seen a

recent update; but hard to say what's in store or what lay ahead there.

The SeaMonkey® Project

www.seamonkey-project.org

Also the latest Firefox 57 "quantum" browser. This leaves previous extensions

and add-ons unsupported as there is shift in technologies in this.

How to download and install Firefox on Mac - support.mozilla.org/firefox

This article explains how to download and install Firefox on a Mac.

My Macs that use Firefox v 56, one day I found them upgraded to v 57.

So the feature set, supported extensions/add-ons, etc all changed...

It's good to choose the upgrade settings wisely, to know there is newer

upgrade but not install automatically.

Older versions such as Firefox ESR builds have limited life, but are available.

For those whose Safari cannot see upgrade or update for security, and their

mac cannot upgrade to later Mac OS X, another browser is key to online use.

Good luck & happy computing! 🙂

You can download any web browser which supports your macOS version; running one designed for Windows requires installing that OS or using a product such as CrossOver Mac as well.

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Other choices.

Opera Browser 10.9 or higher

Waterfox 10.8 or higher