diff --git a/src/utils/background.js b/src/utils/background.js
index b9cd7455..646abe80 100644
--- a/src/utils/background.js
+++ b/src/utils/background.js
@@ -1,5 +1,10 @@
 import { getCourtFromUrl } from './url_and_cookie_helpers.js';
 
+let isSafari =
+  /Safari/.test(navigator.userAgent) &&
+  !/Chrome|Chromium/.test(navigator.userAgent);
+let executionWorld = isSafari ? 'MAIN' : chrome.scripting.ExecutionWorld.MAIN;
+
 export function chooseVariant(details) {
   const options = ['A-A', 'A-C', 'B-B', 'B-D'];
   const randomIndex = Math.floor(Math.random() * options.length);
@@ -123,13 +128,12 @@ export function getAndStoreVueData(req, sender, sendResponse) {
     .executeScript({
       target: { tabId: sender.tab.id },
       func: getVueDiv,
-      world: chrome.scripting.ExecutionWorld.MAIN,
+      world: executionWorld,
     })
     .then((injectionResults) => sendResponse(injectionResults));
 }
 
-
-export function overwriteSubmitMethod(req, sender, sendResponse){
+export function overwriteSubmitMethod(req, sender, sendResponse) {
   const _overwriteScript = () => {
     document.createElement('form').__proto__.submit = function () {
       this.id = 'form' + new Date().getTime();
@@ -154,7 +158,7 @@ export function overwriteSubmitMethod(req, sender, sendResponse){
     .executeScript({
       target: { tabId: sender.tab.id },
       func: _overwriteScript,
-      world: chrome.scripting.ExecutionWorld.MAIN,
+      world: executionWorld,
     })
     .then((injectionResults) => sendResponse(injectionResults));
 }