I have a neuro issue where these trigger my migraines. And they've become standard web design. I currently reduce layout.frame_rate to 1, which *helps* unsmooth scrolling animation. That's often enough to navigate pages with narrow sidebars, or with good visual contrast between the sidebar and the content. But it's not enough on pages with extra-wide sadobars and no visual contrast, such as Wikipedia's "Vector" redesign, or the Internet Archive's latest redesign: https://en.wikipedia.org https://archive.org/details/texts?tab=collection I can force Wikipedia into mobile, which helps, but I'm not aware of a similar fix for the Internet Archive, and really need a global fix. I can get reasonable behavior from the Internet Archive if I reduce the window to about 640 pixels, ... but instead of a non-scrolling sidebar taking 1/3 of the screen, I end up with a non-scrolling desktop taking up 2/3 of the screen!