I added a Safari Extension fot my Mac OS App.
Because of need localizable App, I configed the InfoPlist.strings for App Extension's Info.plist,
CFBundleDisplayName = "App name"
NSHumanReadableDescription = "Human Readable";
The CFBundleDisplayName and NSHumanReadableDescription worked
but NSExtension's SFSafariToolbarItem always can't work,
hear is the two snapshot
https://raw.githubusercontent.com/lengain/LengainGraphBed/master/picture/1.jpg
https://raw.githubusercontent.com/lengain/LengainGraphBed/master/picture/2.jpg
Hope your suggest