--- title: Using Safari app extension default keys framework: safariservices role: article role_heading: Article path: safariservices/using-safari-app-extension-default-keys --- # Using Safari app extension default keys Learn about the default keys in the information property list file. ## Overview Overview After you create a Safari app extension target in Xcode, you need to modify the information property list file, Info.plist. You make changes to identify your new Safari app extension, and specify its capabilities and access limits under the NSExtension key. The keys under the NSExtension key apply to the Safari app extension point, com.apple.Safari.extension for macOS. Place these keys as subordinates of the NSExtension key. A Safari app extension includes these entries by default: Although SFSafariContentScript, SFSafariToolbarItem, and SFSafariWebsiteAccess are all default keys, they’re not required because they specify features that may or may not exist in your Safari app extension. To learn more about feature keys, see Setting Safari app extension feature keys. Review the sample information property list The code example below represents the overall structure of a typical NSExtension dictionary. Keep this structure in mind as you configure each element of your app extension. NSExtensionPointIdentifier com.apple.Safari.extension NSExtensionPrincipalClass SafariExtensionHandler SFSafariToolbarItem Action Command Identifier Button Image ToolbarItemIcon.pdf Label Your Button SFSafariContextMenu Text Search for selected text in MyApplication. Command Search Text Add an entry for selected text in MyApplication. Command Add SFSafariContentScript Script script.js SFSafariStyleSheet Style Sheet style.css SFSafariWebsiteAccess Allowed Domains *.webkit.org Level Some