Description of problem: On or before 9/19/15, my Firefox (Nightly) downloads began failing (see https://bugzilla.mozilla.org/show_bug.cgi?id=1206432). Today, I need to scan a document from my HP8600 as I've done hundreds of times; but these scans fail (PDF).  Tried konqueror; but it completely locks up as the scan starts.  

Using strace, I get this at the end of the attempt via konqueror:
getdents(23, /* 0 entries */, 32768)    = 0
close(23)                               = 0
munmap(0x7ff79ca67000, 231721)          = 0
getresuid([500], [500], [500])          = 0
getresgid([500], [500], [500])          = 0
open("/usr/share/locale/en_US.UTF-8/LC_MESSAGES/gtk30.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale/en_US.utf8/LC_MESSAGES/gtk30.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale/en_US/LC_MESSAGES/gtk30.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale/en.UTF-8/LC_MESSAGES/gtk30.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale/en.utf8/LC_MESSAGES/gtk30.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale/en/LC_MESSAGES/gtk30.mo", O_RDONLY) = 23
fstat(23, {st_mode=S_IFREG|0644, st_size=3268, ...}) = 0
mmap(NULL, 3268, PROT_READ, MAP_PRIVATE, 23, 0) = 0x7ff7f7a0b000
close(23)                               = 0
rt_sigaction(SIGPIPE, {SIG_IGN, [PIPE], SA_RESTORER|SA_RESTART, 0x7ff8051916b0}, {SIG_IGN, [PIPE], SA_RESTORER|SA_RESTART, 0x7ff8051916b0}, 8) = 0
futex(0x7ff7fe5b1568, FUTEX_WAKE, 2147483647) = 0
write(2, "\n(konqueror:21216): GLib-GObject"..., 95
(konqueror:21216): GLib-GObject-WARNING **: cannot register existing type 'GdkDisplayManager'
) = 95
write(2, "\n(konqueror:21216): GLib-CRITICA"..., 88
(konqueror:21216): GLib-CRITICAL **: g_once_init_leave: assertion 'result != 0' failed
) = 88
write(2, "\n(konqueror:21216): GLib-GObject"..., 110
(konqueror:21216): GLib-GObject-CRITICAL **: g_object_new: assertion 'G_TYPE_IS_OBJECT (object_type)' failed
) = 110
futex(0x7ff7fe5b1568, FUTEX_WAIT, 309, NULLopenjdk version "1.8.0_60"
OpenJDK Runtime Environment (build 1.8.0_60-b27)
OpenJDK 64-Bit Server VM (build 25.60-b23, mixed mode)
[konqueror locked-up/unresponsive and no more strace output]



Version-Release number of selected component (if applicable):

I Keep my system up-to-date...  these are the most recent ~100 updates:
$ rpm -qa --last | head -100
[snipped today's updates since the problem started days ago]
libpixman1_0-0.32.8-1.mga5.i586               Fri 25 Sep 2015 07:44:05 PM EDT
rpcbind-0.2.2-1.1.mga5.x86_64                 Fri 25 Sep 2015 07:44:04 PM EDT
timezone-2015f-1.mga5.x86_64                  Fri 25 Sep 2015 07:44:03 PM EDT
unzip-6.0-13.1.mga5.x86_64                    Fri 25 Sep 2015 07:44:02 PM EDT
icedtea-web-1.6.1-1.mga5.x86_64               Fri 25 Sep 2015 07:44:01 PM EDT
lib64pixman-devel-0.32.8-1.mga5.x86_64        Fri 25 Sep 2015 07:42:26 PM EDT
firefox-en_ZA-38.3.0-1.mga5.noarch            Fri 25 Sep 2015 07:42:26 PM EDT
firefox-en_GB-38.3.0-1.mga5.noarch            Fri 25 Sep 2015 07:42:26 PM EDT
java-1.8.0-openjdk-accessibility-1.8.0.60-1.b27.1.mga5.x86_64 Fri 25 Sep 2015 07:42:25 PM EDT
java-1.8.0-openjdk-devel-1.8.0.60-1.b27.1.mga5.x86_64 Fri 25 Sep 2015 07:42:24 PM EDT
java-1.8.0-openjdk-1.8.0.60-1.b27.1.mga5.x86_64 Fri 25 Sep 2015 07:42:23 PM EDT
java-1.8.0-openjdk-headless-1.8.0.60-1.b27.1.mga5.x86_64 Fri 25 Sep 2015 07:42:20 PM EDT
timezone-java-2015f-1.mga5.x86_64             Fri 25 Sep 2015 07:42:17 PM EDT
firefox-38.3.0-1.mga5.x86_64                  Fri 25 Sep 2015 07:42:16 PM EDT
lib64pixman1_0-0.32.8-1.mga5.x86_64           Fri 25 Sep 2015 07:42:13 PM EDT
pyzy-db-android-0.1.0-6.mga5.noarch           Tue 22 Sep 2015 11:45:29 PM EDT
android-opengl-api-javadoc-1.1-8.mga5.noarch  Tue 22 Sep 2015 11:45:29 PM EDT
android-opengl-api-1.1-8.mga5.noarch          Tue 22 Sep 2015 11:45:29 PM EDT
android-tools-4.4.2_r2-4.mga5.x86_64          Tue 22 Sep 2015 11:45:28 PM EDT
pdftk-2.02-1.mga5.x86_64                      Fri 18 Sep 2015 11:15:50 AM EDT
lib64gcj15-4.9.2-4.mga5.x86_64                Fri 18 Sep 2015 11:15:49 AM EDT
libgcj15-base-4.9.2-4.mga5.x86_64             Fri 18 Sep 2015 11:15:48 AM EDT
dhcp-client-4.3.2-1.1.mga5.x86_64             Thu 17 Sep 2015 09:14:56 PM EDT
dhcp-common-4.3.2-1.1.mga5.x86_64             Thu 17 Sep 2015 09:14:55 PM EDT
flash-plugin-11.2.202.508-release.x86_64      Wed 16 Sep 2015 06:24:50 PM EDT
libldap2.4_2-2.4.40-3.1.mga5.i586             Wed 16 Sep 2015 05:00:31 PM EDT
ipython-2.3.0-2.3.mga5.noarch                 Wed 16 Sep 2015 05:00:30 PM EDT
qemu-2.1.3-2.6.mga5.x86_64                    Wed 16 Sep 2015 05:00:28 PM EDT
lib64ldap2.4_2-devel-2.4.40-3.1.mga5.x86_64   Wed 16 Sep 2015 05:00:28 PM EDT
qemu-img-2.1.3-2.6.mga5.x86_64                Wed 16 Sep 2015 05:00:25 PM EDT
lib64spice-server1-0.12.5-2.1.mga5.x86_64     Wed 16 Sep 2015 05:00:25 PM EDT
openldap-2.4.40-3.1.mga5.x86_64               Wed 16 Sep 2015 05:00:24 PM EDT
lib64ldap2.4_2-2.4.40-3.1.mga5.x86_64         Wed 16 Sep 2015 05:00:24 PM EDT
lib64vdpau1-1.1.1-1.mga5.x86_64               Mon 14 Sep 2015 02:21:19 PM EDT
mysql-MariaDB-10.0.21-1.mga5.x86_64           Mon 14 Sep 2015 02:21:18 PM EDT
lib64mariadb-embedded18-10.0.21-1.mga5.x86_64 Mon 14 Sep 2015 02:21:18 PM EDT
xfsprogs-3.2.4-1.mga5.x86_64                  Mon 14 Sep 2015 02:21:17 PM EDT
preload-0.6.4-7.1.mga5.x86_64                 Mon 14 Sep 2015 02:21:17 PM EDT
lib64xfs1-3.2.4-1.mga5.x86_64                 Mon 14 Sep 2015 02:21:16 PM EDT
mariadb-feedback-10.0.21-1.mga5.x86_64        Mon 14 Sep 2015 02:21:10 PM EDT
lib64mariadb-devel-10.0.21-1.mga5.x86_64      Mon 14 Sep 2015 02:21:10 PM EDT
mariadb-extra-10.0.21-1.mga5.x86_64           Mon 14 Sep 2015 02:21:09 PM EDT
mariadb-core-10.0.21-1.mga5.x86_64            Mon 14 Sep 2015 02:21:04 PM EDT
mariadb-10.0.21-1.mga5.x86_64                 Mon 14 Sep 2015 02:21:04 PM EDT
mariadb-common-core-10.0.21-1.mga5.x86_64     Mon 14 Sep 2015 02:21:03 PM EDT
mariadb-common-10.0.21-1.mga5.x86_64          Mon 14 Sep 2015 02:21:02 PM EDT
mariadb-client-10.0.21-1.mga5.x86_64          Mon 14 Sep 2015 02:21:01 PM EDT
lib64mariadb18-10.0.21-1.mga5.x86_64          Mon 14 Sep 2015 02:21:00 PM EDT
libxml2_2-2.9.1-11.1.mga5.i586                Sun 13 Sep 2015 02:05:47 PM EDT
libpcre1-8.37-2.2.mga5.i586                   Sun 13 Sep 2015 02:05:47 PM EDT
libuuid1-2.25.2-3.1.mga5.i586                 Sun 13 Sep 2015 02:05:46 PM EDT
libblkid1-2.25.2-3.1.mga5.i586                Sun 13 Sep 2015 02:05:46 PM EDT
libxml2-utils-2.9.1-11.1.mga5.x86_64          Sun 13 Sep 2015 02:05:43 PM EDT
libxml2-python-2.9.1-11.1.mga5.x86_64         Sun 13 Sep 2015 02:05:42 PM EDT
lib64uuid-devel-2.25.2-3.1.mga5.x86_64        Sun 13 Sep 2015 02:05:42 PM EDT
cmake-3.0.2-1.mga5.x86_64                     Sun 13 Sep 2015 02:05:40 PM EDT
screen-4.2.1-3.1.mga5.x86_64                  Sun 13 Sep 2015 02:05:39 PM EDT
php-odbc-5.6.13-1.mga5.x86_64                 Sun 13 Sep 2015 02:05:03 PM EDT
lib64bluedevil2-2.1-1.1.mga5.x86_64           Sun 13 Sep 2015 02:05:02 PM EDT



How reproducible: always


Steps to Reproduce:
1. no idea.  Suspect an update since no-one else seems to have the issue on Firefox Nightly, yet.  
2.
3.

I really want to classify this as a Major bug because it affects me greatly; but that's not appropriate...  


Reproducible: 

Steps to Reproduce: