@leex, Firefox is now at version 47.0. Are you still seeing this problem? If so, please advise and change the bug status back to "New".
** Changed in: firefox (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to firefox in Ubuntu. https://bugs.launchpad.net/bugs/1527508 Title: after closing firefox 34.0. firefox process is not completed, and continues to work without allowing restart firefox Status in firefox package in Ubuntu: Incomplete Bug description: After closing firefox 34.0. firefox process is not completed, and continues to work without allowing restart firefox. Problem appeared after updating ProblemType: Bug DistroRelease: Ubuntu 14.04 Package: ubuntu-release-upgrader-core 1:0.220.8 ProcVersionSignature: Ubuntu 3.16.0-56.75~14.04.1-generic 3.16.7-ckt20 Uname: Linux 3.16.0-56-generic x86_64 ApportVersion: 2.14.1-0ubuntu3.19 Architecture: amd64 CrashDB: ubuntu CurrentDesktop: X-Cinnamon Date: Fri Dec 18 12:19:23 2015 InstallationDate: Installed on 2015-05-19 (212 days ago) InstallationMedia: Ubuntu 14.04.2 LTS "Trusty Tahr" - Release amd64 (20150218.1) PackageArchitecture: all SourcePackage: ubuntu-release-upgrader Symptom: dist-upgrade UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1527508/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp