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I have copied the code from the following example on the Apple Developer site.
When I run the extension, it runs normally except the injected script is run 3 times causing the output to be written to console.log 3 times. I also put a alert in the doBigCalc function and it opened 3 alerts.
Why is this happening/is it supposed to happen?
You don’t speak to your implementation, but it could be that your code isn’t the problem. The key is understanding that an injected script is loaded …. From the injected script documentation: