[Bug 766545] New: Pale Moon browser hang/deadlock on exit

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=766545

            Bug ID: 766545
           Summary: Pale Moon browser hang/deadlock on exit
    Classification: Platform
           Product: GStreamer
           Version: 1.8.0
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gstreamer (core)
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: zaibatsu7 at gmail.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Created attachment 328036
  --> https://bugzilla.gnome.org/attachment.cgi?id=328036&action=edit
gst_liblist

Hi. I'm using Firefox-based PaleMoon 26.2.2 x86 browser on Xubuntu 16.04 x64.
Recently installed Gstreamer libs, all fine except on-exit deadlock with 100%
load. With media.gstreamer.enabled=false no any issues (and no mp4 video), as
before. Tried various combinations of good/bad/ugly plugin sets with same
result.

Steps to reproduce: open youtube, start playing HD video, close browser.

More often occurs with vk.com videos (almost every time), less with YT.

Attached gdb threads output and dpkg list of installed libs.

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