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About this Add-on
You can download this addon from: https://addons.mozilla.org/zh-CN/firefox/addon/change-hosts/
You will need not to restart firefox after changing your hosts file in /etc/hosts or c:\windows\system32\drivers\etc\hosts if you have installed this extension, just click the Clear DNS Cache button in the context menu or the "tools" menu.
In deed, this extension just changes the parameter network.dnsCacheExpiration to 0, then restore it.