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Like in the title, how to clear that cache? There are some plugins, but its installation is disabled for Firefox Quantum...
https://addons.mozilla.org/en-US/firefox/addon/dns-flusher/
https://addons.mozilla.org/en-us/firefox/addon/clear-dns-cache/
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Click on Firefox at the top left of your browser, go to the History menu, select Clear Recent History and check all boxes. Under Time range to clear select Everything (except passwords, if desired) and click Clear Now.
Clearing the DNS cache in Firefox can be done by simply restarting the browser as the cache is not maintained on the disk. However, there is a way that you can follow to clear just the DNS cache in memory without needing to restart your browser.
Android (version 12)Open Chrome. In the URL bar type in chrome://net-internals/#dns: In the left pane select DNS. In the right pane tap the Clear host cache button.
You can take look at about:networking#dns which directly lets you clear the cache.
And Where does Firefox keep cached DNS responses? had already been answered by Firefox's Support Team.
ScreenShot:
By the way for chrome it is chrome://net-internals/#dns
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about:preferences in address barPrivacy & Security in the menu on the left sideHistory Section click at the link clear your recent history and select:
Today (or whatever fits)Cache
Clear now
This worked for me and is the same as the other answer which was down-voted by any reason, maybe people didn't actually try or maybe something else was missing. Not sure if also the DNS cache of the OS needs to be cleared:
sudo killall -HUP mDNSResponder;say DNS cache has been flushed
cmd > run: ipconfig /flushdns
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