Developing a Safari Web Extension
Customize and enhance web pages by building a Safari web extension.
Overview
Configure the Sample Code Project
Before you run the sample code project in Xcode:
Open Safari and choose Develop > Allow Unsigned Extensions.
In the project settings in Xcode, select the Sea Creator target.
Click the Signing & Capabilities tab.
For Signing Certificate, choose Sign to Run Locally. (Leave Team set to None.)
Repeat steps 3 and 4 for the Sea Creator Extension target.