I wish for either:

1) Zoom buttons just for the paper - the article text is often tiny, and zooming in with the browser messes up the page layout and makes the page practically unusable.

OR

2) A simple direct button to download the PDF directly. This would alleviate the zoom problem since I can view it in my local PDF reader with the best settings for me. Having to go to arxiv to download the PDF for every paper would be a nuisance over time though, so a button in the top bar would make the experience a lot better.