This is a reopen of MDL-70144.

Steps to reproduce:

1. Create a quiz with the "Browser security" option set to "Full screen popup with some Javascript security"
2. Start a quiz attempt as a student
3. Copy the URL from the popup window and open it in a new tab in the main browser window
4. Finish the quiz and click "Finish Review" after reviewing the quiz attempt

What I expected:

Redirection to the main quiz page with the summary of previous attempts.

What actually happens:

Redirection to /mod/quiz/0 resulting in a 404 error.

Suspected cause:

In mod/quiz/module.js:285 the close function of the secure window is called without the first parameter "Y", causing the other parameters to be misinterpreted. Specifically, the delay of 0 gets passed as the url, which is why we are redirected to /mod/quiz/0.

This issue affects many students on our Moodle site (>50% of quiz participants), most of whom definitely didn't manually open the URL from the popup window in another tab. I suspect that this is caused by their browsers blocking the popup window and opening the quiz in a new tab instead.

I will attach a proposed solution (removing the parameter "Y" from the close function) shortly.