Firefox for Android issue that only affects one website?

I've seen similar issues caused by image formats, lazy-loading settings, caching conflicts, or CSS that behaves slightly differently in Firefox compared to Chromium-based browsers. If possible, try testing with Firefox's Enhanced Tracking Protection disabled temporarily and check whether any extensions are affecting page rendering. Just curious, what type of project are you working on? Sometimes the overall setup and content structure can provide additional clues about what's causing the issue.

I took a quick look and one thing I'd check is whether the affected users are all running the same Firefox version or using similar privacy settings. I've seen cases where Enhanced Tracking Protection or aggressive content blocking caused images and page elements to behave differently than expected.

It might also be worth testing with image lazy-loading disabled on a few pages to see if the issue disappears. If the reports are inconsistent, there may be a specific device, Firefox version, or extension combination involved rather than a general site-wide problem.

I took a quick look and one thing I'd check is whether the affected users are all running the same Firefox version or using similar privacy settings. I've seen cases where Enhanced Tracking Protection or aggressive content blocking caused images and page elements to behave differently than expected.

It might also be worth testing with image lazy-loading disabled on a few pages to see if the issue disappears. If the reports are inconsistent, there may be a specific device, Firefox version, or extension combination involved rather than a general site-wide problem.