A bookmarklet. Click it to enjoy the web in Verdana. Verdana, 14 pixels, no smoothing. Click again to undo. Nothing installed, nothing tracked.

there was Verdana ⮨ drag onto your bookmarks bar

Chrome

  1. Show the bookmarks bar: Ctrl/Cmd + Shift + B.
  2. Drag the gray button onto it.
  3. Click the bookmark on any site. Click again to switch off.

Safari · Mac

  1. Dragging strips the code, so bookmark this page: Cmd + D.
  2. Bookmarks › Edit Bookmarks, rename it there was Verdana.
  3. Right-click › Edit Address, paste the code →.

Safari · iPhone

  1. Copy the code →.
  2. Share › Add Bookmark › Save.
  3. Bookmarks › Edit, open it, paste the code as the address.
  4. Run it: type the bookmark name in the address bar, select it.
Show the code (for Safari paste) — must start with javascript: 
javascript:(function(){var i='verdana-bookmarklet-styles';var e=document.getElementById(i);if(e){e.remove();return;}var s=document.createElement('style');s.id=i;s.textContent='*{font-family:Verdana,Geneva,sans-serif !important;font-size:14px !important;-webkit-font-smoothing:none !important;-moz-osx-font-smoothing:unset !important;font-smooth:never !important;text-rendering:optimizeSpeed !important;}';document.head.appendChild(s);})();
Some sites block bookmarklets, and the effect resets on reload — normal for bookmarklets. Verdana by Matthew Carter, bookmarklet by No Plans