I have installed it but I don't know from where to access it I don't find it anywhere in the browser.

1. 能够处理的字符串有些短，包括生成和识别
2. 某些图片不能识别，参照前面那个3星的评价

非常好用扩展，能在地址显示非常方便

识别和生成都挺不错的，不过有个小问题，就是img标签src使用base64的图标无法识别，不知道作者有没有什么办法去处理一下？

生成、识别、加上地址栏上的按钮，本来需要3个插件，现在用这一个就行了。

不错，满足了的我需求

Nice add-on, almost the one with code reading function. But does not read some QR codes easily readable by mobile apps. Few samples (links are temporal, please don't miss):

http://oi64.tinypic.com/i52frd.jpg
http://oi67.tinypic.com/2cfe5b5.jpg
http://oi64.tinypic.com/2mh687q.jpg

(you can check them online here for instance: https://zxing.org/w/decode.jspx )

Will amend this rating when problem is fixed.

生成二维码速度很快，而且居然还支持识别二维码就很难得，唯一缺点是识别有点问题，黑色白底的最容易识别，其他颜色容易无法识别

Very very good, highly recommend. QR icon in url bar! Why do only a few people use it, this is a must have extension.