[Bug 1956365] [NEW] Firefox snap package can not resolve .local dns names

[Gary Allan]

Public bug reported:

Firefox snap package does not resolve .local dns names after recent
update.

After a recent snap package update of Firefox I can no longer resolve
.local DNS names for my local network. This ONLY impacts the Firefox
snap package. Brave, Chrome and DNS resolution on the local terminal
(ping) are working correctly.

When opening https://docker.local developer tools displays the error
NS_ERROR_UNKNOWN_HOST

gary at orion:~$ ping docker.local
PING docker.local (192.168.0.18) 56(84) bytes of data.
64 bytes from docker.local (192.168.0.18): icmp_seq=1 ttl=64 time=2.37 ms
64 bytes from docker.local (192.168.0.18): icmp_seq=2 ttl=64 time=2.74 ms
64 bytes from docker.local (192.168.0.18): icmp_seq=3 ttl=64 time=2.53 ms
64 bytes from docker.local (192.168.0.18): icmp_seq=4 ttl=64 time=2.46 ms
64 bytes from docker.local (192.168.0.18): icmp_seq=5 ttl=64 time=2.41 ms

Running WireShark shows Firefox sending a single SOA DNS request to the local DNS server. 
No DNS requests for the docker.local A record are generated by the Firefox snap package.

56	3.699461647	192.168.0.101	192.168.0.15	DNS	65	Standard query 0x70f9 SOA local
57	3.702560799	192.168.0.15	192.168.0.101	DNS	65	Standard query response 0x70f9 SOA local


I have tested this faulty behavior on multiple machines running Ubuntu 20.04 and Ubuntu 21.10.

** Affects: firefox (Ubuntu)
     Importance: Undecided
         Status: New

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Title:
  Firefox snap package can not resolve .local dns names

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