Question

I want to overload navigator.geolocation.getCurrentPosition and navigator.geolocation.watchPosition to simulate geolocation during
development. Is it possible to do it using Google Chrome extension?

Answer 1

You mean something like this?

navigator.geolocation.getCurrentPosition = function(successCallback, errorCallback) {
    successCallback({coords:{lattitude:10, longitude:20}});
}

If it is just for your own needs then it would be much easier to just do it in your js code.

If you want to make extension out of it then:

• This code needs to be injected on every page of your app (via content script) and put inside dynamically created <script> tag, otherwise you will be inside content script sandbox and your overwritten function will not be visible to the parent page.
• You would need to run this code before your app uses geolocation. There is no easy solution for this.