URL: https://mip.moe.gov.sa/noor/account/signin?ReturnUrl=/noor/issue/wsfed?wtrealm=https%3A%2F%2Ffg.moe.gov.sa%2F&wctx=WsFedOwinState%3DaR-2GIA1jOKYArdjs37UnG-Rtdz7dOJmN3Q45bGTHNfRYJ01T6Y0hoABoOzeMM2d8wup0BRjn4klzovQFm-fOMtUdGArukfFbBdo9gsm-SH62R4qxjvI6iFK-MvsS3VOeu1l8Bq6FxmQ-vctGqIGXw&wa=wsignin1.0
Browser / Version: Firefox Mobile 75.0
Operating System: Android
Tested Another Browser: Yes
Problem type: Something else
Description: Captcha not showing
Steps to Reproduce:
Browser Configuration
_From webcompat.com with 鉂わ笍_
Thanks for the report, I was able to reproduce the issue.


Note:
Tested with:
Browser / Version: Firefox Preview Nightly 200309 (馃: 75.0a1-20200306094739), Firefox Beta 68.6b5
Operating System: Huawei P20 Lite (Android 8.0.0) - 1080 x 2280 pixels, 19:9 ratio (~432 ppi density), Samsung Galaxy S6 Edge (Android 7.0) - 1440 x 2560 pixels (~577 ppi pixel density)
Moving to Needsdiagnosis for further investigation.
I can confirm that this is not reproducible in Firefox (Fennec) and Firefox Preview stable, 3.2.1 (Build #20250350)
28.0.3, f0dc2cadd
GV: 73.0-20200123172213


And apparently the black box was caused by the img response of a HTTP request. This seems to be a regression.

This is breaking because of sameSite=lax cookie (https://bugzilla.mozilla.org/show_bug.cgi?id=1604212)
When requesting initial image (GET to https://mip.moe.gov.sa/noor/captcha/generate?t=fc8b9010644c4abbb489c292c779baee) and on all subsequent requests (POST to https://mip.moe.gov.sa/noor/captcha/refresh) certain cookies are expected, however they're not set
Looks like these are the cookies that are expected:

The site should set SameSite=None; Secure when setting those two cookies. I'll move this to needscontact
After retesting the issue I confirm that the issue has been fixed.

Tested with:
Browser / Version: Firefox Nightly 200825(馃 81.0a1-20200820093209)
Operating System: OnePlus6 (Android 10) - 1080 x 2280 pixels (~402 ppi pixel density)
Closing the issue as fixed.
Most helpful comment
I can confirm that this is not reproducible in Firefox (Fennec) and Firefox Preview stable, 3.2.1 (Build #20250350)
28.0.3, f0dc2cadd
GV: 73.0-20200123172213
And apparently the black box was caused by the
imgresponse of a HTTP request. This seems to be a regression.