Can a Safari web extension change Safari's browser preferences

Question

Is it possible to write a Safari extension that changes the web browsers preference settings?

If so where would I find documentation on this? I would like to add a search engine to the list of default ones so if there is already an extension that does this that you know off that would also be great.

Answer 1

Unfortunately the answer to your question would be a No, at least for now.

As to where you can find out more about this information, you may refer the MDN documentation on browser settings.