I found somethig interesting to this link :
https://support.mozilla.org/en-US/kb/update-firefox-latest-version

Update Firefox to the latest version

By default, Firefox is set to automatically update itself but you can always do a manual update. Here's how:

Note: If you use your Linux distribution's packaged version of Firefox, you will need to wait for an updated package to be released to its package repository.
This article only applies if you installed Firefox manually (without using your distribution's package manager).
  • Click the menu button New Fx Menu , click help Help-29 and select About Firefox.
  • The About Firefox window will open and Firefox will begin checking for updates and downloading them automatically.
    • When the updates are ready to be installed, click Restart Firefox to Update.

    ======================
    I already updated manually firefox so it doesn't work anymore for me.
    But perhaps can be good for other people.




    On Fri, Sep 30, 2016 at 8:12 AM, Angelo Moreschini <mrangelo.fedora@gmail.com> wrote:
    Hi Francois,

    I also thought something like what you said...,

    but I took a look to the unpacked files  ...
    .... there I found some files that look to be able to work good in order to configure firefox...:
    • updater.ini
    • updater
    • precomplete
    • removed-files
    • platform.ini
    • ...............
    ....
    (for example)... the content of the file precomplete is this :

    ================================
    remove "updater.ini"
    remove "updater"
    remove "run-mozilla.sh"
    remove "removed-files"
    remove "precomplete"
    remove "plugin-container"
    remove "platform.ini"
    remove "omni.ja"
    remove "libxul.so"
    remove "libssl3.so"
    remove "libsoftokn3.so"
    remove "libsoftokn3.chk"
    remove "libsmime3.so"
    remove "libplds4.so"
    remove "libplc4.so"
    ..............................
    ,.............................
    rmdir "icons/"
    rmdir "gtk2/"
    rmdir "gmp-clearkey/0.1/"
    rmdir "gmp-clearkey/"
    rmdir "dictionaries/"
    rmdir "defaults/pref/"
    ..............................
    ,.............................
    ===========================
    are you sure that simply unpack the files in /usr/local is the best way to arrange the installation ?

    thank you

    Angelo


    On Thu, Sep 29, 2016 at 6:59 PM, François Patte <francois.patte@mi.parisdescartes.fr> wrote:
    Le 29/09/2016 16:30, Angelo Moreschini a écrit :
    > thank you to answering me,
    >
    > I re installed firefox because it didn't work for all the graphic
    > plugins that was required ....
    >
    > (before that with the .tar file) I tried also with yum to get the file
    > from repository, but I get only a old version that didn't solve my
    > problem... And using .tar file I get -firefox 49- that run all the
    > graphic plug in that I need..
    >
    > I use Fedora 21, and I wouldn't TRY to re install fedora in order to
    > change only firefox...

    As root, unpack the tar archive in /usr/local, then create a simlink in
    /usr/local/bin pointing to /usr/local/firefox/firefox


    --
    François Patte
    UFR de mathématiques et informatique
    Laboratoire CNRS MAP5, UMR 8145
    Université Paris Descartes
    45, rue des Saints Pères
    F-75270 Paris Cedex 06
    Tél. +33 (0)1 8394 5849
    http://www.math-info.univ-paris5.fr/~patte


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