Script editor works, Applescript does not ?

I created a new test project and put your code into it (slightly tweaked, my version is pasted in below) and it works as expected, logging this:

2017-08-10 09:51:16.068210+0100 xxom[3464:234634] <NSAppleEventDescriptor: 'utxt'("Firefox Browser Privacy Notice — Mozilla")>

Have you tried this in a new test project? If not, I recommend that you do.

Also, is your main app sandboxed?

Share and Enjoy
—
Quinn “The Eskimo!”
Apple Developer Relations, Developer Technical Support, Core OS/Hardware

let myEmail = "eskimo" + "1" + "@apple.com"

OSAScript *scriptNAME= [[OSAScript alloc] initWithSource:@"tell application \"Firefox\" to return name of window 1"];
NSDictionary * errorDict = nil;
NSAppleEventDescriptor * returnDescriptor = [scriptNAME executeAndReturnError: &errorDict];
NSLog(@"%@", returnDescriptor);

Hi Eskimo

Thanks for the reply.

Ok, after testing in and out of Sand Box app, you are spot on, the app is Sandboxed as it is a store app, this stops direct FireFox AppleScript. Chome and Safari Applescript work fine in my sandboxed app. Is there a way around this as adding FireFox support to my app would be great.

Edit: will try adding priviliages but not got much hope looking at https://wiki.mozilla.org/Security/Sandbox

Cheers

Geoff

EDITED:

Ok, all working now, all I needed was the entitlement which I had forgot to include.

I added the entitlement: com.apple.security.temporary-exception.apple-events for org.mozilla.firefox

Many thanks for pointing me in the right direction.