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How to - Configure Firefox to use only DoH and not to fallback to OS native resolver

In this post, i will talk about configuring firefox browser to use DoH and not to fallback to OS native resolver  Step 1 :- Configure DoH like the way it is mentioned here - https://support.mozilla.org/en-US/kb/firefox-dns-over-https . I am using  https://doh.nkn.in/dns-query   (which is the DoH server of https://www.nkn.in and in alpha testing stage) as my DoH server in firefox browser. Step 2 :- Check you configuration by typing  about:networking#dns in the browser address bar. Most probably, you will see something like this --  Here, the DoH Mode option handles how firefox manages your DNS queries.  This document (https://wiki.mozilla.org/Trusted_Recursive_Resolver) talks about the options available under 'DoH Mode'. So, if you want to use only DoH and not to fallback to native OS resolver, you can change the value of this parameter to '3'.  Step 3 :- For changing the value of 'DoH Mode' parameter, type  about:config in the browser's address bar and
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IP Ratings

An IP rating must begin with 5 for partial dust protection or 6 for complete dust protection. The IP rating is two digits, with the first and second digit defined as follows:  First Digit (intrusion protection) 0. (or X - see section below): No special protection. Not rated (or no rating supplied) for protection against ingress of this type.  1. Protection from a large part of the body such as a hand (but no protection from deliberate access); from solid objects greater than 50mm in diameter.  2. Protection against fingers or other object not greater than 80mm in length and 12mm in diameter (accidental finger contact).  3. Protection from entry by tools, wires etc, with a diameter of 2.5 mm or more.  4. Protection against solid objects larger than 1mm (wires, nails, screws, larger insects and other potentially invasive small objects such as tools/small etc).  5. Partial protection against dust that may harm equipment.  6. Totally dust tight. Full protection against dust and other parti