Forwarded to '/_relay_' on Vivaldi Browser

When accessing a stackblitz URL in Vivaldi Browser (Based on Chromium), one is first presented with the stackblitz but after a few seconds is redirected to a ‘/relay’ page, which is blank. The same procedure works fine in chrome.

Test URL: https://ng-bootstrap.github.io/stackblitzes/modal/basic/stackblitz.html

• Works fine in Google Chrome.
• Does not work in Vivaldi (Redirected to https://gc7jnj.run.stackblitz.io/_relay_ and shown a blank page).

Opening the console shows that this ‘relay’ page throws:

relay-c3986cb1a910cf654ebcb.js:1 Failed to execute 'postMessage' on 'DOMWindow': The target origin provided ('https://stackblitz.com') does not match the recipient window's origin ('https://upy1so.run.stackblitz.io').

What’s the issue here?

[ahmed2m]

I’ve never been able to use stackblitz on Vivaldi, it’s really frustrating and already gave me automatic impressions when I compare stackblitz with any service like them.

[certainlyakey]

I have Content blocking disabled globally in Vivaldi, and still the issue is there.

It’s actually even worse on websites that use Stackblitz in an iframe - the whole page gets redirected to an empty screen, like here https://ngneat.github.io/elf/docs/store. So this makes it impossible to even view those web pages which are not part of Stackblitz (at least for more than several seconds).