WebRequest extension test that changes the response.

background.js

// The subsequent requests for the videofiles fails, but it was fun to test.
// http://www.oppetarkiv.se/
// https://developer.chrome.com/extensions/webRequest

chrome.webRequest.onBeforeRequest.addListener(
  function(info) {
    console.log(`Intercepted ${info.url}`);
    return {redirectUrl: 'data:application/json,{"inSweden":true}'};
  },
  {
    urls: ["*://www.svtstatic.se/video/geocheck/"],
    types: ["xmlhttprequest"]
  },
  ["blocking"]
);

manifest.json

{
  "name": "Stängt Arkiv",
  "version": "1.0",
  "description": "Tricks Öppet Arkiv that you are in Sweden.",
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "*://www.svtstatic.se/"
  ],
  "background": {
    "scripts": ["background.js"]
  },
  "manifest_version": 2
}