1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17<!doctype html> <style type="text/css"> #mainPopup { padding: 10px; height: 200px; width: 400px; font-family: Helvetica, Ubuntu, Arial, sans-serif; } h1 { font-size: 2em; } </style> <div id="mainPopup"> <h1>Hello extensionizr!</h1> <p>To shut this popup down, edit the manifest file and remove the "default popup" key. To edit it, just edit ext/page_action/page_action.html. The CSS is there, too.</p> </div>