<i>Locking this thread.</i><br><i>Please continue here: [[/questions/1404519]]</i><br> Hi I have a sandbox iframe which is hosted by various websites. Lets assume that this iframe is loaded like this: <script src="https://example.com/wie.js"></script> I have already added 'allow-scripts allow-forms allow-modals allow-same-origin allow-popups allow-popups-to-escape-sandbox allow-storage-access-by-user-activation' at sandbox. I also use document.requestStorageAccess() from inside the iframe and I set event listeners for the storage like this: window.addEventListener('storage', onStorageFunc, false);. From the iframe a popup window is presented when user clicks a specific button and the popup opens at lets say at this url "https://paypal.com". After user navigation on popup, paypal at the end of the flow redirects user to this url "https://example.com/success". At this point when user is navigated to /success I add some data to local storage which I expect to trigger the storage event listener and the onStorageFunc to run. This doesn't happen, while in other browsers it works as expected. Since both popup and iframe are under the same url (https://example.com) and I have used requestStorageAccess, I would expect this to work normally. Can you please help me to find out what is going wrong here? In the past I had the same problem but it was fixed when I added 'requestStorageAccess' and 'allow-storage-access-by-user-activation'. Now I can see it happening again.