That version is now dead
http://news.softpedia.com/news/ubuntu-17-04-zesty-zapus-has-reached-end-of-life-upgrade-to-ubuntu-17-10-now-519360.shtml
** Changed in: firefox (Ubuntu)
Status: Confirmed => Invalid
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https://bugs.launchpad.net/bugs/1710987
Title:
Since the update to 55.0.1 firefox hangs frequently with 100% cpu
usage
Status in firefox package in Ubuntu:
Invalid
Bug description:
Just received the upgrade. Unfortunately, firefox is hardly usable
now. Rather frequently, CPU usage jumps up to 100% of a core, with the
FF UI completely frozen. In some occasione, the hang is temporary. In
others it is permanent and the application must be terminated.
I suggest reverting ubuntu to FF 54 until the FF 55 issues are
resolved upstream.
ProblemType: Bug
DistroRelease: Ubuntu 17.04
Package: firefox 55.0.1+build2-0ubuntu0.17.04.2
ProcVersionSignature: Ubuntu 4.10.0-32.36-generic 4.10.17
Uname: Linux 4.10.0-32-generic x86_64
ApportVersion: 2.20.4-0ubuntu4.5
Architecture: amd64
BuildID: 20170814193419
CurrentDesktop: KDE
Date: Wed Aug 16 00:07:52 2017
EcryptfsInUse: Yes
InstallationDate: Installed on 2013-12-12 (1342 days ago)
InstallationMedia: Kubuntu 13.10 "Saucy Salamander" - Release amd64
(20131016.1)
SourcePackage: firefox
UpgradeStatus: Upgraded to zesty on 2017-05-04 (103 days ago)
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