Being completely happy with my siduction as is (with exception of youtube, which I only use 1-2 times a week), I doubt very much, whether a new installation of the recent iceweasel-candidate will solve my problem or will damage my system with such a lot of removals, i.e.:
[09:10:15] root@thinkpad-s540:/home/jorg# apt-cache policy iceweasel
iceweasel:
Installed: 38.1.0esr-3
Candidate: 45.5.1esr-1
Version table:
45.5.1esr-1 0
500 http://httpredir.debian.org/debian/ unstable/main amd64 Packages
*** 38.1.0esr-3 0
100 /var/lib/dpkg/status
[09:11:52] root@thinkpad-s540:/home/jorg# apt-cache policy firefox
firefox:
Installed: (none)
Candidate: 50.0.2-1
Version table:
50.0.2-1 0
500 http://httpredir.debian.org/debian/ unstable/main amd64 Packages
[09:12:11] root@thinkpad-s540:/home/jorg# apt-get install -s iceweasel
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following extra packages will be installed:
akonadi-backend-mysql akonadi-server binutils dbus default-mysql-client-core
default-mysql-server-core digikam-data ffmpeg firefox-esr firefox-esr-l10n-de
firefox-esr-l10n-en-gb firefox-esr-l10n-it firefox-esr-l10n-pl firefox-esr-l10n-pt-br
firefox-esr-l10n-ro gcc-6-base glib-networking glib-networking-common glib-networking-services
iceweasel-l10n-de iceweasel-l10n-en-gb iceweasel-l10n-it iceweasel-l10n-pl iceweasel-l10n-pt-br
iceweasel-l10n-ro kde-runtime kde-runtime-data kdelibs-bin kdelibs5-data kdelibs5-plugins
kdepim-kresources kdepimlibs-kio-plugins kdoctools kipi-plugins-common knode ktimetracker libaio1
libakonadi-calendar4 libakonadi-contact4 libakonadi-kcal4 libakonadi-kde4 libakonadi-kmime4
libakonadi-notes4 libakonadi-xml4 libass5 libastro1 libav-tools libavcodec57 libavdevice57
libavfilter6 libavformat57 libavresample3 libavutil55 libbaloopim4 libbs2b0 libc-bin libc-dev-bin
libc-l10n libc6 libc6-dev libcalendarsupport4 libchromaprint1 libdbus-1-3 libdvdnav4 libdvdread4
libebur128-1 libexiv2-14 libflite1 libgcrypt20 libgif7 libglib2.0-0 libgme0 libgnutls30
libgpgme++2v5 libgpgme11 libgphoto2-6 libgphoto2-port12 libgrantlee-core0 libgrantlee-gui0
libgssapi-krb5-2 libhunspell-1.4-0 libicu57 libilmbase12 libincidenceeditorsng4 libinput-bin
libinput10 libjack-jackd2-0 libk5crypto3 libkabc4 libkalarmcal2 libkblog4 libkcal4 libkcalcore4
libkcalutils4 libkcmutils4 libkde3support4 libkdeclarative5 libkdecore5 libkdepim4
libkdepimdbusinterfaces4 libkdesu5 libkdeui5 libkdewebkit5 libkdgantt2-0 libkdnssd4
libkemoticons4 libkf5akonadicore5 libkf5akonadiprivate5 libkf5akonadiwidgets5 libkf5auth-data
libkf5auth5 libkf5bookmarks-data libkf5bookmarks5 libkf5completion-data libkf5completion5
libkf5config-bin libkf5config-data libkf5configcore5 libkf5configgui5 libkf5configwidgets-data
libkf5configwidgets5 libkf5coreaddons-data libkf5coreaddons5 libkf5crash5 libkf5filemetadata-data
libkf5filemetadata3 libkf5i18n-data libkf5i18n5 libkf5iconthemes-data libkf5iconthemes5
libkf5itemmodels5 libkf5jobwidgets-data libkf5jobwidgets5 libkf5kdelibs4support-data
libkf5kiocore5 libkf5kiofilewidgets5 libkf5kiowidgets5 libkf5newstuff-data
libkf5notifications-data libkf5parts-data libkf5service-bin libkf5service-data libkf5service5
libkf5sonnetui5 libkf5textwidgets-data libkf5textwidgets5 libkf5widgetsaddons-data
libkf5widgetsaddons5 libkf5windowsystem-data libkf5windowsystem5 libkf5xmlgui-data libkf5xmlgui5
libkfile4 libkholidays4 libkhtml5 libkidletime4 libkimap4 libkimproxy4 libkio5 libkjsapi4
libkjsembed4 libkldap4 libkleo4 libkmbox4 libkmediaplayer4 libkmime4 libknewstuff2-4
libknewstuff3-4 libknotifyconfig4 libkntlm4 libkontactinterface4a libkparts4 libkpgp4
libkpimidentities4 libkpimtextedit4 libkpimutils4 libkprintutils4 libkpty4 libkrb5-3
libkrb5support0 libkresources4 libkrosscore4 libktexteditor4 libktnef4 libkunitconversion4
libkutils4 libkxmlrpcclient4 liblirc-client0 liblircclient0 libltdl7 libmailcommon4
libmailimporter4 libmailtransport4 libmariadbclient18 libmessagecomposer4 libmessagecore4
libmessagelist4 libmessageviewer4 libmicroblog4 libncurses5 libncursesw5 libnepomuk4
libnepomukquery4a libnepomukutils4 libnspr4 libnss3 libopenal-data libopenal1 libopenconnect5
libopencv-core2.4v5 libopencv-imgproc2.4v5 libopenexr22 libopenjp2-7 libphonon4 libphonon4qt5-4
libpimcommon4 libplasma3 libpng16-16 libpostproc54 libproxy-tools libproxy1v5 libqgpgme1
libqt5core5a libqt5dbus5 libqt5gui5 libqt5network5 libqt5printsupport5 libqt5qml5 libqt5script5
libqt5sql5 libqt5sql5-mysql libqt5sql5-sqlite libqt5svg5 libqt5widgets5 libqt5x11extras5
libqt5xml5 librubberband2 libsdl2-2.0-0 libsendlater4 libsnappy1v5 libsndio6.1 libsodium18
libsolid4 libsoxr0 libssh2-1 libssl1.0.2 libstdc++6 libswresample2 libswscale4 libsyndication4
libtasn1-6 libtemplateparser4 libthreadweaver4 libtinfo5 libva1 libvlc-bin libvlc5 libvlccore8
libvpx4 libwacom-common libwacom2 libwayland-client0 libwebp6 libwebpmux2 libx264-148 libx265-95
libxapian22v5 libxcb-xinerama0 libzmq5 linux-libc-dev locales marble-data
mariadb-client-core-10.0 mariadb-common mariadb-server-core-10.0 mysql-common
plasma-scriptengine-javascript vlc-data
Suggested packages:
akonadi-backend-postgresql binutils-doc ffmpeg-doc fonts-stix otf-stix fonts-lmodern mozplugger
libgnomeui-0 djvulibre-bin finger glibc-doc libdvdcss2 exiv2 alsa-base rng-tools gnutls-bin
gphoto2 krb5-doc krb5-user jackd2 hspell lirc libportaudio2 qt5-image-formats-plugins qtwayland5
qt5-qmltooling-plugins sndiod media-player-info xapian-tools
Recommended packages:
gstreamer1.0-libav icoutils libcanberra-pulse libcanberra-gstreamer sound-theme-freedesktop
fonts-dejavu manpages-dev libglib2.0-data xdg-user-dirs libgphoto2-l10n libkf5filemetadata-bin
libkf5iconthemes-bin sonnet-plugins libkf5xmlgui-bin krb5-locales qttranslations5-l10n
qt5-gtk-platformtheme va-driver-all va-driver libwacom-bin
The following packages will be REMOVED:
akonadiconsole akregator baloo baloo-utils baloo4 digikam digikam-private-libs dolphin
gstreamer0.10-plugins-good gstreamer1.0-plugins-good k3b k3b-i18n kaddressbook kalarm kamoso
kde-baseapps kde-config-gtk-style kde-plasma-desktop kdepim kdepim-groupware kdepim-wizards
kipi-plugins kleopatra kmail knotes kontact korganizer ktorrent libavfilter4 libavfilter5
libbaloowidgets4 libebml4 libgpgme++2 libk3b6 libk3b6-extracodecs libkf5kdelibs4support5
libkf5newstuff5 libkf5notifications5 libkf5parts5 libkfilemetadata4 libkipi10 libkolab0
libkolabxml1 libmarblewidget19 libmatroska6 libopenconnect2 libopenconnect3 libopencv-calib3d2.4
libopencv-contrib2.4 libopencv-core2.4 libopencv-features2d2.4 libopencv-flann2.4
libopencv-highgui2.4 libopencv-imgproc2.4 libopencv-legacy2.4 libopencv-ml2.4
libopencv-objdetect2.4 libopencv-video2.4 libproxy1 libtag1c2a libtagc0 moc nepomuk-core-runtime
phonon-backend-vlc vlc vlc-nox vlc-plugin-pulse
The following NEW packages will be installed:
akonadi-backend-mysql default-mysql-client-core default-mysql-server-core ffmpeg firefox-esr
firefox-esr-l10n-de firefox-esr-l10n-en-gb firefox-esr-l10n-it firefox-esr-l10n-pl
firefox-esr-l10n-pt-br firefox-esr-l10n-ro gcc-6-base libaio1 libavcodec57 libavdevice57
libavfilter6 libavformat57 libavresample3 libavutil55 libbaloopim4 libbs2b0 libc-l10n
libcalendarsupport4 libchromaprint1 libebur128-1 libexiv2-14 libflite1 libgif7 libgme0
libgnutls30 libgpgme++2v5 libgrantlee-core0 libgrantlee-gui0 libhunspell-1.4-0 libicu57
libilmbase12 libincidenceeditorsng4 libinput-bin libinput10 libkdepimdbusinterfaces4
libkdgantt2-0 libkf5akonadicore5 libkf5akonadiprivate5 libkf5akonadiwidgets5 libkf5config-bin
libkf5itemmodels5 libkf5service-bin liblirc-client0 libmailcommon4 libmailimporter4
libmariadbclient18 libmessagecomposer4 libmessageviewer4 libopenal-data libopenal1
libopencv-core2.4v5 libopencv-imgproc2.4v5 libopenexr22 libopenjp2-7 libpimcommon4 libpng16-16
libpostproc54 libproxy1v5 libqt5sql5-mysql libqt5sql5-sqlite librubberband2 libsdl2-2.0-0
libsendlater4 libsnappy1v5 libsndio6.1 libsodium18 libsoxr0 libssl1.0.2 libswresample2
libswscale4 libtemplateparser4 libvlc-bin libvpx4 libwacom-common libwacom2 libwebp6 libwebpmux2
libx264-148 libx265-95 libxapian22v5 libxcb-xinerama0 libzmq5 mariadb-client-core-10.0
mariadb-common mariadb-server-core-10.0 mysql-common
The following packages will be upgraded:
akonadi-server binutils dbus digikam-data glib-networking glib-networking-common
glib-networking-services iceweasel iceweasel-l10n-de iceweasel-l10n-en-gb iceweasel-l10n-it
iceweasel-l10n-pl iceweasel-l10n-pt-br iceweasel-l10n-ro kde-runtime kde-runtime-data kdelibs-bin
kdelibs5-data kdelibs5-plugins kdepim-kresources kdepimlibs-kio-plugins kdoctools
kipi-plugins-common knode ktimetracker libakonadi-calendar4 libakonadi-contact4 libakonadi-kcal4
libakonadi-kde4 libakonadi-kmime4 libakonadi-notes4 libakonadi-xml4 libass5 libastro1 libav-tools
libc-bin libc-dev-bin libc6 libc6-dev libdbus-1-3 libdvdnav4 libdvdread4 libgcrypt20 libglib2.0-0
libgpgme11 libgphoto2-6 libgphoto2-port12 libgssapi-krb5-2 libjack-jackd2-0 libk5crypto3 libkabc4
libkalarmcal2 libkblog4 libkcal4 libkcalcore4 libkcalutils4 libkcmutils4 libkde3support4
libkdeclarative5 libkdecore5 libkdepim4 libkdesu5 libkdeui5 libkdewebkit5 libkdnssd4
libkemoticons4 libkf5auth-data libkf5auth5 libkf5bookmarks-data libkf5bookmarks5
libkf5completion-data libkf5completion5 libkf5config-data libkf5configcore5 libkf5configgui5
libkf5configwidgets-data libkf5configwidgets5 libkf5coreaddons-data libkf5coreaddons5
libkf5crash5 libkf5filemetadata-data libkf5filemetadata3 libkf5i18n-data libkf5i18n5
libkf5iconthemes-data libkf5iconthemes5 libkf5jobwidgets-data libkf5jobwidgets5
libkf5kdelibs4support-data libkf5kiocore5 libkf5kiofilewidgets5 libkf5kiowidgets5
libkf5newstuff-data libkf5notifications-data libkf5parts-data libkf5service-data libkf5service5
libkf5sonnetui5 libkf5textwidgets-data libkf5textwidgets5 libkf5widgetsaddons-data
libkf5widgetsaddons5 libkf5windowsystem-data libkf5windowsystem5 libkf5xmlgui-data libkf5xmlgui5
libkfile4 libkholidays4 libkhtml5 libkidletime4 libkimap4 libkimproxy4 libkio5 libkjsapi4
libkjsembed4 libkldap4 libkleo4 libkmbox4 libkmediaplayer4 libkmime4 libknewstuff2-4
libknewstuff3-4 libknotifyconfig4 libkntlm4 libkontactinterface4a libkparts4 libkpgp4
libkpimidentities4 libkpimtextedit4 libkpimutils4 libkprintutils4 libkpty4 libkrb5-3
libkrb5support0 libkresources4 libkrosscore4 libktexteditor4 libktnef4 libkunitconversion4
libkutils4 libkxmlrpcclient4 liblircclient0 libltdl7 libmailtransport4 libmessagecore4
libmessagelist4 libmicroblog4 libncurses5 libncursesw5 libnepomuk4 libnepomukquery4a
libnepomukutils4 libnspr4 libnss3 libopenconnect5 libphonon4 libphonon4qt5-4 libplasma3
libproxy-tools libqgpgme1 libqt5core5a libqt5dbus5 libqt5gui5 libqt5network5 libqt5printsupport5
libqt5qml5 libqt5script5 libqt5sql5 libqt5svg5 libqt5widgets5 libqt5x11extras5 libqt5xml5
libsolid4 libssh2-1 libstdc++6 libsyndication4 libtasn1-6 libthreadweaver4 libtinfo5 libva1
libvlc5 libvlccore8 libwayland-client0 linux-libc-dev locales marble-data
plasma-scriptengine-javascript vlc-data
188 upgraded, 91 newly installed, 67 to remove and 1147 not upgraded.
Again thanks for your help, Piper and Jurgen.
Greetings,
Jörg