Since the new twitter font doesn't carry over to stuff like tweets, I decided to make a stylesheet to fix it.
Use Stylish to apply the CSS automatically.
Chrome: https://chrome.google.com/webstore/detail/stylish/fjnbnpbmkenffdnngjfgmeleoegfcffe?hl=en
Firefox: https://addons.mozilla.org/en-US/firefox/addon/stylish/
Before: http://iaero.me/i/E4mee