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[heiko <1471565@xxxxxxxxxxxxxxxxxx>]

This bug affects me as well. In my case FF is starting but all actions like opening a new tab or requesting a web address are refering to an app crash.
Solution up to now: Downgrading to FF 38.0

--
Linux Mint 13 - 32Bit, kernel 3.2.0-87, nvidia 304 graphics driver

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https://bugs.launchpad.net/bugs/1471565

Title:
  Mint 13: Firefox 39.0 crashes right on startup

Status in firefox package in Ubuntu:
  New

Bug description:
  Mint 13 32-bit: Firefox 39.0 crashes right on startup
  with the error message printed twice:
  "    [NPAPI 8734] ###!!! ABORT: Aborting on channel error.: file /build/firefox-ALgUKk/firefox-39.0+build5/ipc/glue/MessageChannel.cpp, line 1597"

  This affects the Firefox package Firefox 39.0-build5-0ubuntu0.12.04.1
  provided by the Ubuntu Mozilla Security team.

  The problematic file in the firefox package seems to be the file
  libxul.so. This is where the crash actually occurs.

  Note:
  --------
  This crash seems to happen on any 32-bit version of Linux Mint 13.
  It does not seem, however, to affect Ubuntu 12.04.x 32-bit, on which Mint 13 32-bit is based.

  The file libxul.so installed as part of Firefox 39.0-build5-0ubuntu0.12.04.1 is dated 29-Jun 2015 14:19.
  The file libxul.so that comes as part of the genuine Mozilla tarball has got the date 01-Jul-2015 02:49.

  Replacing the libxul.so installed through the PPA by the genuine
  Mozilla file solves the isse, as far as I can test and tell.

  For more details, please, see this report in the Linux Mint forum:
  http://forums.linuxmint.com/viewtopic.php?f=47&t=199433 (Mint 13: Firefox 39.0 crashes right on startup)

  It would be greatly appreciated if this problem could by investigated and hopefully solved before Firefox 39.0 will be made available on the normal Ubuntu repos, because this is where Mint13, too, like Ubuntu 12.0.4x, fetches most of it software from.
  And up to Firefox 38.0, the Ubuntu provided Firefox has always run perfectly fine on Mint 13, too.

  ---
  Requested details:

  (1) ~$ lsb_release -rd
  Description:	Linux Mint 13 Maya
  Release:	13
  ~$ cat /etc/os-release
  NAME="Ubuntu"
  VERSION="12.04.5 LTS, Precise Pangolin"
  ID=ubuntu
  ID_LIKE=debian
  PRETTY_NAME="Ubuntu precise (12.04.5 LTS)"
  VERSION_ID="12.04"
  ~$ 

  (2) ~$ apt-cache policy firefox
  firefox:
    Installiert: 39.0+build5-0ubuntu0.12.04.1
    Kandidat:    39.0+build5-0ubuntu0.12.04.1
    Versionstabelle:
   *** 39.0+build5-0ubuntu0.12.04.1 0
          500 http://ppa.launchpad.net/ubuntu-mozilla-security/ppa/ubuntu/ precise/main i386 Packages
          100 /var/lib/dpkg/status
       38.0+build3-0ubuntu0.12.04.1 0
          500 http://archive.ubuntu.com/ubuntu/ precise-updates/main i386 Packages
          500 http://security.ubuntu.com/ubuntu/ precise-security/main i386 Packages
       11.0+build1-0ubuntu4 0
          500 http://archive.ubuntu.com/ubuntu/ precise/main i386 Packages

  (3) Firefox 39 should start up as Firefox 38 did

  (4) Yet, instead it crashes on startup
        all you can do is decide to send a bug report or not. No chance of using Firefox 39.

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