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# Steps to reproduce this issue on Firefox 1. Go to `about:preferences`, 2. Scroll down to `Language and Appearance` section, 3. Select `Colors...` button,  4. Change `Background` color to...

> I guess the right solution would be to manually specifying the default background color instead of assuming it's white. I guess so. > I'm just puzzled on whether changing...

> When setting a background color it is best practice to also set a foreground color and vice versa (in CSS). It looks like the iframes have their background color...

Unfortunately, depending on the case, the issue still persists. It is mostly visible with tables. Using https://developer.mozilla.org/en-US/docs/Web/HTML/Element/tr#frame_explicitly_specifying_table_content_groups as an example in Firefox Nightly. | | Light site theme | Dark...