I'll add having a floating header that covers the top portion of the page, and only appears when you scroll up. I like to read text in the top third of the page, then scroll down so the lines I'm reading are still in the top third of the page. With the height of my monitor that's the most comfortable position, this should usually be the case if following common ergonomic guidelines. If I scroll up, very often such a header will appear & cover the text I was trying to scroll up to read, so I have to scroll farther. Then it's visible, so I scroll down to move it back up to the top portion of the page as the header goes away. Lather, rinse, repeat, install a uBlock origin filter to get rid of floating headers.