CentOS 7.x Disable Firefox DNS cache

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<yambe:breadcrumb>CentOS_7.x_Firefox|CentOS 7.x Firefox</yambe:breadcrumb>

CentOS 7.x Disable Firefox DNS cache

If you open a site and it fails due to DNS issues. Then if you update OS DNS (/etc/resolv.conf in Linux) then refreshing firefox does not solves the problem, although "ping hostname" in OS works fine. This is because firefox caches DNS entries and also perhaps DNS server location. To disable this behavior use:

  1. Open about:config
  2. Set following values:
    • network.dnsCacheExpiration :: 0
    • network.dnsCacheExpirationGracePeriod :: 0
    • network.dnsCacheEntries :: 0
    • network.dns.disablePrefetch :: true

This should make DNS work directly based on current OS settings

Refer:

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