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For how long Firefox and Chrome cache DNS records in its own(browser) DNS cache ? Do they respect TTL ?
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Google Chrome also keeps a DNS cache of its own, and it is separate from the DNS cache stored by your operating system.
DNS records get cached in myriad places (inside the browser, both literally—via the Host Resolver Cache, and implicitly– in the form of already-connected keep-alive sockets), in the operating system, in your home router, in the upstream ISP, and so forth.
Firefox is an Internet browser which integrates a DNS cache feature. This feature automatically saves the DNS settings of websites that you frequently visit. DNS settings are records that contain a website's domain name and its corresponding Internet Protocol address.
Specifies how long (1 to 2592000 seconds) an entry that records a negative answer to a query remains stored in the DNS cache. The value must be provided as a TimeSpan. The default setting is 15 minutes.
I think its a duplication of Firefox invalidate dns cache
There are two configuration values for it in Firefox:
network.dnsCacheExpiration and network.dnsCacheExpirationGracePeriod with a default of 60 seconds (v45).
More info: http://kb.mozillazine.org/Network.dnsCacheExpiration
In Chrome: chrome://net-internals/#dns It seems the default is ~1minute (v66).
Don't forget about your system DNS cache. The browser does not talk with the DNS server directly, but rather your system resolver, so TTL is irrelevant here.
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