my mac air don't open safari browser

2011 Mac notebooks can run macOS 10.13.6 (High Sierra) – but nothing higher. That means that you are stuck with an outdated version of Safari.

To update to High Sierra, see:

How to download and install macOS - Apple Support

Once you are on Sierra or High Sierra, you may want to install Firefox 115 ESR. It is no longer getting new features, but Mozilla says they will be providing critical security updates until September 2024.

https://support.mozilla.org/en-US/kb/firefox-users-macos-1012-1013-1014-moving-to-extended-support

That may let you access some sites that do not display correctly in High Sierra's version of Safari, or that complain about that version of Safari being too old and insecure.

epigmenio195 Said:

"my mac air don't open safari browser: i made the up date on the sofware but safari is not work my macbook year is 2011 an said safari needs up date ** i can't ** an up date"

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Updating the macOS:

Determining which Update(s) will Install:

I. Verify Compatibility:

A. Start Here: Learn About Compatibility and how to Identify your Specific Mac Model - Apple Support

B. How to Verify:

I Reveal your Model:

What is the Model of your Mac? To find out...

1. Go to: Apple menu
2. Click: About this Mac
3. View: Second Line-Down

then...

II. Compare the Results:

See if the Model you found is shown here:

• macOS Ventura is Compatible with these Computers - Apple Support
• macOS Monterey is Compatible with these Computers - Apple Support
• macOS Big Sur 11 Hardware Requirements - Apple Support
• macOS Catalina 10.15 - Hardware Requirements - Apple Support
• macOS Mojave 10.14 - Hardware Requirements - Apple Support
• macOS High Sierra 10.13 - Hardware Requirements - Apple Support
• macOS Sierra 10.12 - Hardware Requirements - Apple Support
• OS X El Capitan 10.11 - Hardware Requirements - Apple Support
• OS X Yosemite 10.10 - Hardware Requirements - Apple Support

III. If Compatible:

Back Up your Mac First:  Be certain you Create a Time Machine Backup of your Mac, so that way you can have something to restore your Mac from, should anything go wrong with the reconfiguration.