Update 'subfiles/change-firefox-dns.md'

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Mozilla (Firefox) has partnered up with Cloudflare and will resolve the domain names from the application itself via a DNS server from Cloudflare.
Cloudflare will then be able to read everyones DNS requests.
You can disable it in “about:config".
> You can disable it in “about:config"
- The string value of "`network.trr.uri`" should be empty.
- The string value of "`network.trr.resolvers`" should be set to `[]`.
> Or in /distribution/policies.json` (Firefox ESR)
```
...
"DNSOverHTTPS": {
"Enabled": false,
"ProviderURL": "https://0.0.0.0/"
},
...
```
Some other settings can also contain Cloudflare URLs. It is recommended to search for "`cloudflare`".
GNU Icecat and older Firefox versions(<68) are not affected *yet*.