What is Site Isolation and How it Protects You?

site isolation

The web is a dark and mysterious place. There are scams, malware, viruses and other vulnerabilities hiding everywhere. Most users aren’t aware because of protections and securities built-in to their web browser. With Chrome 63, Google has brought another important feature to keep its users safe: Site Isolation.

Chrome will load each website in its own process. That means each process are independent and uses dedicated memory to process information from each tab. This ensures that even if one tab crashes, other tabs continue to work efficiently.

Therefore, even if a malicious site bypasses the same-origin policy, the extra security will help stop the site from stealing your data from another website. This also helps to prevent against a security bug in browsers, called universal cross-site scripting (UXSS), so that even if an attacker somehow bypasses the same-origin policy, they will not be able to completely own the process. This will help prevent attacks posed by vulnerabilities such as Spectre and Meltdown.

Here’s how to increase security with site isolation:

Enable site isolation

When you turn on site isolation, Chrome offers more security protections for your browser.

➝ On your computer, open Chrome browser.

➝ In the address bar at the top, enter the address:

➝ chrome://flags/#enable-site-per-process

➝ Press Enter.

➝ Next to “Strict site isolation,” click Enable.

➝ Click Relaunch now.

If you don’t see “Strict site isolation,” update Chrome to the latest version. (Site Isolation is available only from Chrome 63 and later versions.)


Memory: Site isolation will increase Chrome’s memory use by roughly 10%-20%.

Printing: Cross-site iframes will be blank. To print the entire page, save the page to your computer. Then, open and print the saved file.

DevTools: Chrome Developer Tools don’t fully support cross-site iframes with site isolation.

Having dedicated memory slots for each tab does have an impact on system memory. The Chrome browser will use 10%-20% more RAM. But this doesn’t matter for latest computers that host 4GB of RAM and above versions.

Even though Chrome uses more system resources, considering the added securities, Site Isolation is worth it.

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