如何让firefox立刻感知hosts文件的改变

修改hosts文件后，firefox不会立刻感知hosts文件的修改，要重启firefox才能更新

请问如何在修改hosts文件后，让firefox在不重启的状态下，立刻感知变化？

答案或建议：

ipconfig /flushdns can clear the cache;
ipconfig /displaydns can display the dns cache.

本机的hosts文件也会在/displaydns时显示.其实这个在ipconfig –help里面有显示，就是一直没注意@_@
/all Display full configuration information.
/release Release the IP address for the specified adapter.
/renew Renew the IP address for the specified adapter.

/flushdns Purges the DNS Resolver cache.
/registerdns Refreshes all DHCP leases and re-registers DNS names
/displaydns Display the contents of the DNS Resolver Cache.
/showclassid Displays all the dhcp class IDs allowed for adapter.
/setclassid Modifies the dhcp class id.

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