Minimizing firefox makes unity freeze

[Kim Stebel]

1) Description: Ubuntu Raring Ringtail (development branch)
Release: 13.04

2)

k@a:~$ apt-cache policy unity
unity:
  Installed: 6.12.0daily13.04.01-0ubuntu1
  Candidate: 6.12.0daily13.04.01-0ubuntu1
  Version table:
 *** 6.12.0daily13.04.01-0ubuntu1 0
        500 http://de.archive.ubuntu.com/ubuntu/ raring/main amd64 Packages
        100 /var/lib/dpkg/status

k@a:~$ apt-cache policy firefox
firefox:
  Installed: 19.0.2+build1-0ubuntu1
  Candidate: 19.0.2+build1-0ubuntu1
  Version table:
 *** 19.0.2+build1-0ubuntu1 0
        500 http://de.archive.ubuntu.com/ubuntu/ raring/main amd64 Packages
        100 /var/lib/dpkg/status

k@a:~$ apt-cache policy firefox-globalmenu
firefox-globalmenu:
  Installed: 19.0.2+build1-0ubuntu1
  Candidate: 19.0.2+build1-0ubuntu1
  Version table:
 *** 19.0.2+build1-0ubuntu1 0
        500 http://de.archive.ubuntu.com/ubuntu/ raring/main amd64 Packages
        100 /var/lib/dpkg/status

3) When I maximize firefox and then minimize it, the whole UI hangs. Firefox is minimized, but when I click on the launcher or the panel, nothing happens. The only thing I can do is switch to a terminal with ctrl-alt-f1, log in and kill the X server.

4) I expect minimizing firefox not to freeze the UI.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Luke Sticka (the87thbombfish)]

If it is helpful to say so, in my experience Firefox never fully minimizes. I could not reproduce this with any other programs.

Additionally I experienced this while using the LiveCD (or LiveDVD if you prefer), with the following information.

ubuntu@ubuntu:~$ apt-cache policy unity
unity:
  Installed: 7.0.0daily13.04.18~13.04-0ubuntu1
  Candidate: 7.0.0daily13.04.18~13.04-0ubuntu1
  Version table:
 *** 7.0.0daily13.04.18~13.04-0ubuntu1 0
        500 http://archive.ubuntu.com/ubuntu/ raring/main amd64 Packages
        100 /var/lib/dpkg/status

ubuntu@ubuntu:~$ apt-cache policy firefox
firefox:
  Installed: 20.0+build1-0ubuntu2
  Candidate: 20.0+build1-0ubuntu2
  Version table:
 *** 20.0+build1-0ubuntu2 0
        500 http://archive.ubuntu.com/ubuntu/ raring/main amd64 Packages
        100 /var/lib/dpkg/status

ubuntu@ubuntu:~$ apt-cache policy firefox-globalmenu
firefox-globalmenu:
  Installed: 20.0+build1-0ubuntu2
  Candidate: 20.0+build1-0ubuntu2
  Version table:
 *** 20.0+build1-0ubuntu2 0
        500 http://archive.ubuntu.com/ubuntu/ raring/main amd64 Packages
        100 /var/lib/dpkg/status

[Kim Stebel (kimstebel)]

To work around this problem you can minimize firefox by pressing ctrl + alt + 0.

[Adnan Shameem (needadnan)]

This problem is not with Firefox only. It can be with any window. This is a possible duplicate with this one:
https://bugs.launchpad.net/ubuntu/+bug/1171451

The freeze happens to the last window that is to be minimized. For example if you have 2 open apps. If you minimize the first one, no freeze will occur. But when you minimize the second one the freeze will occur.

When I switch to another workspace and then come back, the freeze is gone.