Lightning Locker Disabled for Unsupported Browsers

Lightning Locker relies on some JavaScript features in the browser: support for strict mode, the WeakMap object, and the Proxy object. If a browser doesn’t meet the requirements, Lightning Locker can’t enforce all its security features and is disabled.

Lightning Locker is enabled in the supported browsers for Lightning Experience. If your app runs in an unsupported browser, you’re likely to encounter issues that won’t be fixed. Make your life easier, and your user’s browsing experience more secure, by requiring your app to run in a supported browser.

See Also

• Supported Browsers
• Salesforce Help: Supported Browsers for Lightning Experience