[Bug 1796979] [NEW] Intermittently can't connect to the server

[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. The latter is successful much more often
than the former.

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

I had mistakenly made a submission to launchpad without running ubuntu-
bug firefox. This is the submission using ubuntu-bug. The old submission
is here: https://bugs.launchpad.net/bugs/1792402

Linux Mint 18.3 Cinnamon

apt-cache policy firefox
firefox:
  Installed: 63.0~b13+build1-0ubuntu0.16.04.1

ProblemType: Bug
DistroRelease: Linux 18.3
Package: firefox 63.0~b13+build1-0ubuntu0.16.04.1 [modified: usr/lib/firefox/browser/defaults/preferences/vendor-firefox.js usr/lib/firefox/distribution/distribution.ini] [origin: LP-PPA-mozillateam-firefox-next]
ProcVersionSignature: Ubuntu 4.15.0-36.39~16.04.1-generic 4.15.18
Uname: Linux 4.15.0-36-generic x86_64
AddonCompatCheckDisabled: False
ApportVersion: 2.20.1-0ubuntu2.18
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  rex        3357 F.... pulseaudio
BuildID: 20181009094547
Channel: beta
CurrentDesktop: X-Cinnamon
Date: Tue Oct  9 15:54:39 2018
DefaultProfileExtensions: extensions.sqlite corrupt or missing
DefaultProfileIncompatibleExtensions: Unavailable (corrupt or non-existant compatibility.ini or extensions.sqlite)
DefaultProfileLocales: extensions.sqlite corrupt or missing
DefaultProfilePlugins: Shockwave Flash - /usr/lib/adobe-flashplugin/libflashplayer.so (adobe-flashplugin)
DefaultProfilePrefSources:
 /usr/lib/firefox/defaults/pref/vendor-gre.js
 /usr/lib/firefox/defaults/pref/channel-prefs.js
 prefs.js
DefaultProfileThemes: extensions.sqlite corrupt or missing
ForcedLayersAccel: False
IfupdownConfig:
 # interfaces(5) file used by ifup(8) and ifdown(8)
 auto lo
 iface lo inet loopback
InstallationDate: Installed on 2017-01-12 (635 days ago)
InstallationMedia: Linux Mint 17.2 "Rafaela" - Release amd64 20150627
IpRoute:
 default via 192.168.103.1 dev wlan0  proto static  metric 600 
 169.254.0.0/16 dev wlan0  scope link  metric 1000 
 192.168.103.0/24 dev wlan0  proto kernel  scope link  src 192.168.103.222  metric 600
MostRecentCrashID: bp-392336ee-2be7-4d6e-89e0-e40350180301
Profile0BrokenPermissions:
 browser-extension-data/uBlock0 at raymondhill.net/storage.js.corrupt (0o600, wrong owner)
 extension-settings.json.corrupt (0o600, wrong owner)
 saved-telemetry-pings/ba50588c-e150-45ec-9d22-916c98101815 (0o600, wrong owner)
 saved-telemetry-pings/f50808ab-da4a-421b-8acd-2795287134d8 (0o600, wrong owner)
Profile0Extensions: extensions.sqlite corrupt or missing
Profile0IncompatibleExtensions: Unavailable (corrupt or non-existant compatibility.ini or extensions.sqlite)
Profile0Locales: extensions.sqlite corrupt or missing
Profile0Plugins: Shockwave Flash - /usr/lib/adobe-flashplugin/libflashplayer.so (adobe-flashplugin)
Profile0PrefSources:
 /usr/lib/firefox/defaults/pref/vendor-gre.js
 /usr/lib/firefox/defaults/pref/channel-prefs.js
 prefs.js
Profile0Themes: extensions.sqlite corrupt or missing
Profiles:
 Profile0 - LastVersion=62.0/20180911150120 (Out of date)
 Profile1 (Default) - LastVersion=63.0/20181009094547 (In use)
RelatedPackageVersions: adobe-flashplugin 1:20181009.1-0ubuntu0.16.04.1
RunningIncompatibleAddons: False
SourcePackage: firefox
SubmittedCrashIDs: bp-392336ee-2be7-4d6e-89e0-e40350180301
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 10/05/2011
dmi.bios.vendor: Hewlett-Packard
dmi.bios.version: F.1B
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: 165A
dmi.board.vendor: Hewlett-Packard
dmi.board.version: 10.31
dmi.chassis.asset.tag: Chassis Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: Hewlett-Packard
dmi.chassis.version: Chassis Version
dmi.modalias: dmi:bvnHewlett-Packard:bvrF.1B:bd10/05/2011:svnHewlett-Packard:pnHPPaviliondv7NotebookPC:pvr058D110000244620001620100:rvnHewlett-Packard:rn165A:rvr10.31:cvnHewlett-Packard:ct10:cvrChassisVersion:
dmi.product.family: 103C_5335KV G=N L=CON B=HP S=PAV
dmi.product.name: HP Pavilion dv7 Notebook PC
dmi.product.version: 058D110000244620001620100
dmi.sys.vendor: Hewlett-Packard

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


** Tags: amd64 apport-bug beta-channel sylvia third-party-packages

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https://bugs.launchpad.net/bugs/1796979

Title:
  Intermittently can't connect to the server

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