根据当前页面的 URL 生成 QR 码
根据当前 Tab 窗口 URL 生成 QR 码，支持在移动端打开、扫描分享到微信等。
* Share to WeChat: Use WeChat's Mobile client to scan two-dimensional code sharing page to the micro-channel circle of friends.
* Save QR Image: Drag the image to your desktop(or other location what you want), the image type is PNG.
This is an open source project: https://github.com/feelinglucky/chrome-plugin-simple-qr-generator
