Open Private Browsing in Safari, Chrome, or Firefox

Private browsing on a MacBook Air works the same way across all three major browsers: you open a new window that doesn't save your history, cookies, or search terms. In Safari, press Command+Shift+N or go to File > New Private Window. In Google Chrome, press Command+Shift+N or click the menu icon (three horizontal lines) and select "New Incognito Window". In Firefox, press Command+Shift+P or go to File > New Private Window.

The private window looks slightly different from a normal one so you know you're browsing privately. Safari dims the address bar and shows "Private" in the top left. Chrome shows "Incognito" with a spy icon. Firefox displays "Private Browsing" with a mask icon. You can open multiple private windows at once, and you can also have a regular window and a private window open simultaneously.

Private browsing does not hide your activity from your internet service provider, your employer if you're on a work network, or the websites you visit. It only prevents your Mac from storing a local record of where you went.

Key Takeaways

  • Safari, Chrome, and Firefox all have keyboard shortcuts to open private windows: Command+Shift+N for Chrome, Command+Shift+N for Safari, and Command+Shift+P for Firefox.
  • Private browsing prevents your MacBook Air from saving your browsing history, cookies, and autofill data, but does not hide your activity from your internet service provider or the websites themselves.
  • You can identify a private window by its visual indicator — Safari shows "Private", Chrome shows "Incognito", and Firefox shows "Private Browsing".
  • You can run a regular window and a private window at the same time, and you can open multiple private windows if you need to keep separate browsing sessions.

What Private Browsing Actually Does and Doesn't Do

When you use a private window, your Mac does not store the websites you visit in your history. It also does not save cookies, which are small files websites use to remember you. Search terms you type into the address bar won't appear in autocomplete suggestions next time. Downloaded files still appear in your Downloads folder, but the browser won't remember the pages you downloaded them from.

Private browsing does not prevent websites from tracking you while you're on them. It does not hide your real IP address or encrypt your connection. If you log into Facebook, Gmail, or any other account in a private window, that company still knows it's you. Your internet service provider can still see which websites you visit. If you're on a work or school network, the network administrator can still see your traffic.

Private browsing is useful when you're shopping for a gift on a shared Mac, when you want to log into two accounts on the same website at once, or when you're using a public computer and don't want to leave a trace of your session on that machine.

Switching Between Private and Regular Browsing

You can have both a private window and a regular window open at the same time. Each one operates independently — websites you visit in the private window won't affect your regular browsing, and vice versa. This is useful if you want to stay logged into your email in a regular window while testing how a website looks to someone who isn't logged in, using a private window.

To switch between them, use Command+Tab to cycle through open applications, or click the Safari, Chrome, or Firefox icon in the Dock and select the window you want. If you have multiple private windows open, they all appear in the Window menu at the top of the screen.

When you close a private window, everything from that session disappears. The next time you open a private window, it starts completely fresh with no memory of the previous one.

Private Browsing Settings You Can Customize

Safari lets you set preferences for private windows separately from regular ones. Go to Safari > Settings, click the Privacy tab, and you'll see options for cookies and website data. You can choose to accept cookies from websites you visit, from websites you visit and third parties, or never. These settings explore to both regular and private windows, but private windows still won't save the cookies after you close them.

Chrome and Firefox have fewer customization options for private mode specifically. Both will respect your general privacy settings — for example, if you've blocked third-party cookies in your regular settings, private windows will also block them. The main difference is that private windows don't save anything locally when you close them.

None of the three browsers let you change what private browsing does at a fundamental level. You cannot make a private window hide your IP address or encrypt your connection — those require a VPN, which is a separate tool.

Using Private Browsing on a Shared MacBook Air

If you share your MacBook Air with family members or roommates, private browsing prevents your session from appearing in the browser history that other users can see. However, it does not prevent someone sitting at your Mac while you're logged in from seeing what you're doing in real time. It also does not prevent them from accessing your saved passwords or payment methods if they know your Mac password.

If privacy from other users is important, consider creating separate user accounts on your Mac. Each account has its own browser history, saved passwords, and browsing data. You can switch between accounts by clicking the user icon in the top right corner of the screen and selecting a different account.

Private browsing is a good first step for casual privacy on a shared device, but it's not a substitute for account separation if you need serious privacy from other people with access to the same Mac.

Private Browsing and Extensions

Browser extensions you've installed will work in private windows, but some extensions behave differently. Ad blockers and password managers typically function normally. Tracking prevention extensions also work in private mode. However, some extensions that rely on storing data locally may not work as expected, since private windows don't save data after you close them.

If an extension isn't working in a private window, check its settings. In Safari, go to Safari > Settings, click Extensions, find the extension, and make sure "Allow in Private Browsing" is toggled on. In Chrome, click the extension icon, select "Manage extension", and toggle "Allow in Incognito". In Firefox, go to about:addons, find the extension, and check its permissions.

Disabling an extension in private mode won't affect how it works in regular windows. You can have different extensions active in private versus regular browsing if you want.

Frequently Asked Questions

Does private browsing hide my activity from my internet service provider?

No. Your internet service provider can see which websites you visit regardless of whether you use private browsing. Private browsing only prevents your Mac from storing a record locally. If you want to hide your activity from your ISP, you need a VPN (virtual private network), which is a separate tool you install on your Mac.

Can someone see what I'm doing in a private window if they have access to my Mac?

If they're sitting at your Mac while you're using it, yes — they can see your screen. If they access your Mac after you've closed the private window, no — private browsing leaves no history. However, if they know your Mac password, they can access your saved passwords and payment methods, which private browsing doesn't protect.

Will websites know I'm using private browsing?

Websites cannot detect whether you're in a private window. They can still see your real IP address, track you with cookies and other methods, and identify you if you log in. Private browsing only affects what your Mac stores locally.

What happens to files I read in a private window?

Downloaded files stay in your Downloads folder permanently. The browser just won't remember which websites you downloaded them from. If you want to delete the files too, you'll need to remove them manually from your Downloads folder.

Can I set private browsing as my default mode?

No. Safari, Chrome, and Firefox all default to regular browsing. You have to open a private window each time you want to use it. This is intentional — the browsers assume most people want their history saved most of the time.