[Bug 1792402] [NEW] Intermittent Server Not Found

[Rex]

Public bug reported:

Intermittently while browsing old and new sites, I run into a Server Not
Found, "Hmm. We’re having trouble finding that site.", "We can’t connect
to the server" page. To workaround I will often hold down the enter key
to rapidly re-attempt to get to the page or close the tab, try again,
and repeat until I get through.

Running in a new Firefox profile and in safe mode seems to make no
difference.

I am running the Firefox beta from the PPA (62.0b20) on my Linux Mint
18.3.

apt-cache policy firefox
firefox:
  Installed: 62.0~b20+build1-0ubuntu0.16.04.1
  Candidate: 62.0+linuxmint4+sylvia
  Version table:
     62.0+linuxmint4+sylvia 700
        700 http://packages.linuxmint.com sylvia/upstream amd64 Packages
     62.0+build2-0ubuntu0.16.04.4 500
        500 http://archive.ubuntu.com/ubuntu xenial-updates/main amd64 Packages
        500 http://security.ubuntu.com/ubuntu xenial-security/main amd64 Packages
 *** 62.0~b20+build1-0ubuntu0.16.04.1 500
        500 http://ppa.launchpad.net/mozillateam/firefox-next/ubuntu xenial/main amd64 Packages
        100 /var/lib/dpkg/status
     45.0.2+build1-0ubuntu1 500
        500 http://archive.ubuntu.com/ubuntu xenial/main amd64 Packages

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

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https://bugs.launchpad.net/bugs/1792402

Title:
  Intermittent Server Not Found

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