Firefox freezes when trying to download a file

[Pierre Rudloff]

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

[Olivier Tilloy (osomon)]

This looks very similar to bug #1811105, so I'm going to mark it as a duplicate. Please check out the screencast attached to that other bug and confirm whether it's the same problem. If not, feel free to remove the duplicate status. Thanks!

[Pierre Rudloff (rudloff)]

I confirm that it looks very similar and is probably the same bug. Sorry for the duplicate.

[Olivier Tilloy (osomon)]

Don't be sorry, that's what triaging is for :)
Thanks for the confirmation.