I've been using firefox's viewport zoom to improve website visibility a lot these days. Traditional zoom reflows the page, but the viewport zoom keeps the page the same, just makes it bigger. You might know this from pinching out on the touchpad on a laptop, but you can do this on a keyboard by setting `mousewheel.with_$KEY.action` to 5 to perform viewport zoom by having a keyboard key pressed. I use it with alt, and use AHK to bind XB2+scroll to emit alts instead (I make it emit ctrl regularly but alt when a firefox window is focused). It has been one of my best usability improvements recently. It's one of those things that, if you make ergonomic enough, you end up using on every single website, since you can make the column width the optimal size for your readability.