I do have a use for seeing a couple more lines of text at the top and bottom of the screen.

Edit: I actually lied, I have often wished I could get to ublock's “select element” control a little easier. Because I so often have to kill obnoxious floating elements :D

- they grow over time, so at first 90% of the vertical space is for content but later it becomes closer to 70% or worse.

- they hide the content that's underneath them, but hitting 'space' (or pgdn) still scrolls a screen's worth of content scrolls, say, 1000 vertical pixels even though you can only see 900-700 pixels' worth of content at a time. I'm forced to either scroll with a mouse wheel, trackpad, etc, or else pgdn and then up-arrow a couple times.

I don't know shit about fuck re: modern web design (I first learned from an ORielly book titled "Dynamic HTML / the definitive reference (2nd edition)"). iframes do the right thing where pgdn scrolls one iframe-height worth of content, but I guess you'd have to have your header/footer "contain" the content as an iframe, and that's weird?