參考網址：
Clear Browing Data
Delete browsing data directly from the browser toolbar. Clear cookies, history and cache with a single click.
JavaScript Errors Notifier
Notifies JavaScript errors by icon in toolbar bar or notification popup
GitHub → https://goo.gl/RBcFK8
Test page → https://goo.gl/IEXS2y
按F12可以快速打開開發人員工具
Print Preview Button
Open the Print Preview to view a page before printing it.
Paper costs money (and trees) so it is worth checking what the page looks like before you print it. Though it has always amazed me just how much the button gets downloaded.