I have a JSInput, the html is blocked by firefox with NS_ERROR_XFO_VIOLATION message in transfer column (status 200). The iframe is black with this message “Firefox can’t open this page” :
File is hosted on LMS_HOST in static folder (from course export, or Files page in the CMS).
It haven’t seen it happen on Chrome. Disabling cache and reloading make it go away it seems. And the issue comes back from time to time, somewhat randomly.
Here for example, I reloaded once again, with cache enabled, it is ok, reloaded twice, issue appear again. I reloaded without cache, and reloaded with cache twice, it is ok, but third time not.
One thing that catches my eye, is x-frame-options: ALLOW response header from Caddy, which value “ALLOW” doesn’t exist in MDN documentation X-Frame-Options - HTTP | MDN
No external resource is loaded in the JSInput html file.
I like to know if anyone has or has had the same issue on Firefox, I am temped to think the issue could be my Firefox and don’t want to waste anyone’s time.
Edit: confirmed to happen on someone else PC (same Open edX).