Public bug reported:

When I browse to a file in Firefox, it opens a popup asking me if I want
to open it or download it. At this moment, Firefox starts using 100% CPU
and freezes.

I started having this problem after a recent update.
It also happens with safe mode.

ProblemType: Bug
DistroRelease: Ubuntu 18.10
Package: firefox 64.0+build3-0ubuntu0.18.10.1
ProcVersionSignature: Ubuntu 4.18.0-13.14-generic 4.18.17
Uname: Linux 4.18.0-13-generic x86_64
AddonCompatCheckDisabled: False
ApportVersion: 2.20.10-0ubuntu13.1
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  pierre     1936 F.... pulseaudio
BuildID: 20181207224759
Channel: Unavailable
CurrentDesktop: XFCE
Date: Tue Jan 15 20:12:38 2019
ForcedLayersAccel: False
IfupdownConfig:
 # interfaces(5) file used by ifup(8) and ifdown(8)
 auto lo
 iface lo inet loopback
IncompatibleExtensions: Default - {972ce4c6-7e08-4474-a285-3208198ce6fd}
InstallationDate: Installed on 2016-04-06 (1014 days ago)
InstallationMedia: Xubuntu 16.04 LTS "Xenial Xerus" - Beta amd64 (20160323)
IpRoute:
 default via 192.168.1.1 dev wlp2s0 proto dhcp metric 600
 169.254.0.0/16 dev wlp2s0 scope link metric 1000
 192.168.1.0/24 dev wlp2s0 proto kernel scope link src 192.168.1.21 metric 600
MostRecentCrashID: bp-cf7fd7ab-ccc0-4602-903e-12ff90180908
PrefSources: prefs.js
Profiles: Profile0 (Default) - LastVersion=64.0/20181207224759 (In use)
RunningIncompatibleAddons: True
SourcePackage: firefox
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 10/21/2015
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 5.11
dmi.board.asset.tag: Tag 12345
dmi.board.name: W510LU
dmi.board.vendor: Notebook
dmi.board.version: Not Applicable
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: Notebook
dmi.chassis.version: N/A
dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvr5.11:bd10/21/2015:svnNotebook:pnW510LU:pvrNotApplicable:rvnNotebook:rnW510LU:rvrNotApplicable:cvnNotebook:ct10:cvrN/A:
dmi.product.family: Not Applicable
dmi.product.name: W510LU
dmi.product.sku: Not Applicable
dmi.product.version: Not Applicable
dmi.sys.vendor: Notebook

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


** Tags: amd64 apport-bug cosmic

** Description changed:

  When I browse to a file in Firefox, it opens a popup asking me if I want
  to open it or download it. At this moment, Firefox starts using 100% CPU
  and freezes.
  
  I started having this problem after a recent update.
+ It also happens with safe mode.
  
  ProblemType: Bug
  DistroRelease: Ubuntu 18.10
  Package: firefox 64.0+build3-0ubuntu0.18.10.1
  ProcVersionSignature: Ubuntu 4.18.0-13.14-generic 4.18.17
  Uname: Linux 4.18.0-13-generic x86_64
  AddonCompatCheckDisabled: False
  ApportVersion: 2.20.10-0ubuntu13.1
  Architecture: amd64
  AudioDevicesInUse:
-  USER        PID ACCESS COMMAND
-  /dev/snd/controlC0:  pierre     1936 F.... pulseaudio
+  USER        PID ACCESS COMMAND
+  /dev/snd/controlC0:  pierre     1936 F.... pulseaudio
  BuildID: 20181207224759
  Channel: Unavailable
  CurrentDesktop: XFCE
  Date: Tue Jan 15 20:12:38 2019
  ForcedLayersAccel: False
  IfupdownConfig:
-  # interfaces(5) file used by ifup(8) and ifdown(8)
-  auto lo
-  iface lo inet loopback
+  # interfaces(5) file used by ifup(8) and ifdown(8)
+  auto lo
+  iface lo inet loopback
  IncompatibleExtensions: Default - {972ce4c6-7e08-4474-a285-3208198ce6fd}
  InstallationDate: Installed on 2016-04-06 (1014 days ago)
  InstallationMedia: Xubuntu 16.04 LTS "Xenial Xerus" - Beta amd64 (20160323)
  IpRoute:
-  default via 192.168.1.1 dev wlp2s0 proto dhcp metric 600 
-  169.254.0.0/16 dev wlp2s0 scope link metric 1000 
-  192.168.1.0/24 dev wlp2s0 proto kernel scope link src 192.168.1.21 metric 600
+  default via 192.168.1.1 dev wlp2s0 proto dhcp metric 600
+  169.254.0.0/16 dev wlp2s0 scope link metric 1000
+  192.168.1.0/24 dev wlp2s0 proto kernel scope link src 192.168.1.21 metric 600
  MostRecentCrashID: bp-cf7fd7ab-ccc0-4602-903e-12ff90180908
  PrefSources: prefs.js
  Profiles: Profile0 (Default) - LastVersion=64.0/20181207224759 (In use)
  RunningIncompatibleAddons: True
  SourcePackage: firefox
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 10/21/2015
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 5.11
  dmi.board.asset.tag: Tag 12345
  dmi.board.name: W510LU
  dmi.board.vendor: Notebook
  dmi.board.version: Not Applicable
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: Notebook
  dmi.chassis.version: N/A
  dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvr5.11:bd10/21/2015:svnNotebook:pnW510LU:pvrNotApplicable:rvnNotebook:rnW510LU:rvrNotApplicable:cvnNotebook:ct10:cvrN/A:
  dmi.product.family: Not Applicable
  dmi.product.name: W510LU
  dmi.product.sku: Not Applicable
  dmi.product.version: Not Applicable
  dmi.sys.vendor: Notebook

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https://bugs.launchpad.net/bugs/1811887

Title:
  Firefox freezes when trying to download a file

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