This extension requires permissions to inject a piece of code in all of the pages you visit. If that freaks you out, that's ok. Handing over those permissions freaks me out too.
You can choose to install this extension from source (it's very short) to make sure it's not doing anything malicious.
See: https://github.com/oslego/chrome-backspace-back#from-source
谷歌浏览器、其他Chromium内核的浏览器
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