Zooming out causes colored lines

[led9]

Hello autor.
You fixed last error, thank you for it.
Im find - maybe not an error, but the unexpected behavior of your extension:
if you add the scale to the picture with the mouse wheel, then at a certain step, thin lines appear instead of a colored spot.
https://i106.fastpic.ru/big/2019/0808/dd/056dd5d0dcec9f886e506b09011421dd.jpg

Firefox nightly 64bit, the newest. This happens on a VERY large scale.
http://ixbt.photo/photo/1032090/57017rIDXzf7XvM/pPHllZQXMv/1301362.jpg this picture. direct link

if not work, then
http://ixbt.photo/?id=photo:1301362&e=1
link "Оригинальная фотография: 2800 x 1935 (4,4 Мб)"