I saw a report online of someone having trouble with the mobile view in desktop Firefox duplicating images, as though the same <img> tag had simply been inserted 2 or 3 times in a row adjacently. This seems likely to be an error with the image lazy-loading, but I haven't been able to reproduce it.

Affected articles included:

• https://en.m.wikipedia.org/wiki/Texas
• https://en.m.wikipedia.org/wiki/Metre#International_prototype_metre_bar