Environment:
Browser / Version: Firefox Nightly 90.0a1 (🦎 90.0a1-20210525093431), Firefox Beta 89.0.0-beta.10 (🦎 89.0-20210523073042)
Operating System: Google Pixel 5 (Android 11) - 1080 x 2340 pixels, 19.5:9 ratio (~432 ppi density), Samsung Galaxy S6 (Android 7.0) - 1440 x 2560 pixels (~577 ppi pixel density)

Prerequisites:
ETP - Strict enabled.

Steps to reproduce:

1. Navigate to https://www.electroplanet.ma/confort-de-la-maison/climatisation/ventilateur?product_list_mode=grid
2. Scroll down the page until reaching the "Ventilateur Argo" (649DH) product.
3. Observe the product image.

Expected Behavior:
The image loads.

Actual Behavior:
The image does not load.

Notes:

1. Screenshot attached.
2. The issue is not reproducible with ETP - Standard.

I'm not convinced that this is actually an ETP issue. If I load the page in strict or private browsing, but with the devtools network panel open, then the page loads for me. That's usually an indication that there is some kind of race condition with the page's scripts loading in an order their scripts are not set up to handle. I'll have to revisit this with a deeper diagnosis of what might be going on.

The issue no longer reproduces on my side, all images on the provided URL load now with any ETP status.
https://prnt.sc/26ng9sa

I've checked other pages and I get the same result, all images load.
URL: https://www.electroplanet.ma/recherche?q=laptop
URL: https://www.electroplanet.ma/recherche?q=gamepad
URL: https://www.electroplanet.ma/recherche?q=tv

Tested with:
Browser / Version: Firefox Nightly 98.0a1 (🦎 98.0a1-20220201093942)
Operating System: Google Pixel 5 (Android 12) - 1080 x 2340 pixels, 19.5:9 ratio (~432 ppi density), Samsung Galaxy S8 (Android 9) - 1440 x 2960 pixels, 18.5:9 ratio (~570 ppi density)