Issues with Firefox Quantum and legacy plugins

Posted: 16th November 2017 by Jab in Ubuntu
Tags: , ,

Like most of us we use our web browsers without thinking and without question. Until one day we log in and realize it has been updated and now our favorite plugin is not working. Some of us use Firefox for work and sometimes a plugin may not have been updated in some time and now it is not working in the latest version of Firefox. So what do you do?

If the plugin cannot be updated anytime soon, my only choice was to revert to an earlier version of Firefox. So that is what I will be showing you how to do today using Ubuntu.

Lets get Started:

  • Make a backup of your Bookmarks
    • From the Menu -> Bookmarks -> Show all Bookmarks
    • Select All Bookmarks on the left then Import and Backup from the menu
    • Choose Backup and save it to a location you can find later if needed.


  • In a terminal cd to your Downloads folder:
  • wget
  • tar -xjf firefox-56.0.tar.bz2
  • sudo rm -rf /opt/firefox55 (May or may not be there)
  • sudo mv firefox /opt/firefox56
  • sudo mv /usr/bin/firefox /usr/bin/firefoxold
  • sudo ln -s /opt/firefox56/firefox-bin /usr/bin/firefox
  • Launch FF as usual – you should be back on 56
    • Once in FF type about:config – agree to the risks
    • – set to false
    • app.update.enabled – set to false
    • app.update.silent – set to false

Hope this helps