The page itself unintentionally hits our "the page is setting src frequently, so we think it's an animation driven setting img.src" detection https://searchfox.org/mozilla-central/rev/71ff2d99628938eb74e983898c0fa2b1be6d5ef9/dom/base/nsImageLoadingContent.cpp#537 Js on the page sets the src to https://static.wixstatic.com/...w_2196,h_858....jpeg and then 400ms later to https://static.wixstatic.com/...w_2196,h_852....jpeg 6 pixels shorter. This is similar to what happens in bug 1786918.
Bug 1836513 Comment 4 Edit History
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The page itself unintentionally hits our "the page is setting src frequently, so we think it's an animation driven by setting img.src" detection https://searchfox.org/mozilla-central/rev/71ff2d99628938eb74e983898c0fa2b1be6d5ef9/dom/base/nsImageLoadingContent.cpp#537 Js on the page sets the src to https://static.wixstatic.com/...w_2196,h_858....jpeg and then 400ms later to https://static.wixstatic.com/...w_2196,h_852....jpeg 6 pixels shorter. This is similar to what happens in bug 1786918.