各浏览器官方离线版下载地址

Mozilla Firefox

https://www.mozilla.org/en-US/firefox/all/#product-desktop-release
https://www.mozilla.org/en-US/firefox/all/#product-desktop-developer

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Google Chrome

https://www.google.cn/chrome/?system=true&standalone=1
https://www.google.cn/intl/zh-CN/chrome/dev/?system=true&standalone=1

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Opera

https://www.opera.com/zh-cn/download

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Microsoft Edge

https://www.microsoft.com/en-us/edge