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Firefox Screenshot Function -- Not Capturing Background Images

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I use the screenshot function for my job, saving finished website is really nice. I noticed though that for some reason background images are not being captured. Instead those areas that have a background image are just blank in the background. I check the full page to make sure everything is loaded on the page before I initiate the full screen screenshot, but I still receive blank background sections. Attached is an example, there are two gray blank sections which should be showing a parallax image. Is it because we are using a parallax image for the background? The Colony Custom Homes image shows a sliver of the image right above the blue section, the blue section actually uses the image as the background. It is also a parallax background image.

I use the screenshot function for my job, saving finished website is really nice. I noticed though that for some reason background images are not being captured. Instead those areas that have a background image are just blank in the background. I check the full page to make sure everything is loaded on the page before I initiate the full screen screenshot, but I still receive blank background sections. Attached is an example, there are two gray blank sections which should be showing a parallax image. Is it because we are using a parallax image for the background? The Colony Custom Homes image shows a sliver of the image right above the blue section, the blue section actually uses the image as the background. It is also a parallax background image.
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I see the problem here, but I don't know why the background image isn't captured:

https://footlooseandsugarfree.com/

You mentioned it being a parallax image. What does that mean?

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A parallax image is basically just an effect. The background image stays fixed and as you scroll the page up/down you see different parts the image. https://www.w3schools.com/howto/howto_css_parallax.asp

I wouldn't think it should matter, as it's still set as a background image. Surely the screenshot function of Firefox should be capturing the entire page, including background images?