Stylish
https://lh3.googleusercontent.com/47_xDZfVTX9KcyOLdE4cUmSwuIqzdOlQWA1dD_8OL2CST4aZ4tKdRcIGDSeG0ASncc8W-i2Xhg=w128-h128-e365-rj-sc0x00ffffff#.png
Website Themes & Skins by Stylish | Userstyles.org
Chrome拡張のStylishが閲覧履歴を収集していた