Due to some firewall issue, you may not able to install Chrome extension directly, in your Chrome browser. Alternatively, you can download the extension from somewhere else and install it.
- Find another machine which could reach Google, go to Chrome网上应用店
- Search the extension and get the URI, for example, Vue.js devtools, the URI is https://chrome.google.com/webstore/detail/vuejs-devtools/nhdogjmejiglipccpnnnanhbledajbpd?hl=zh-CN, copy this link.
- Go to a 3rd party site Chrome Extension Downloader,paste the above link and try download the extension.
- If luckly, you would get the downloaded extension in .crx format, drag it into Chrome and it would get installed automatically.