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<small>The [[Firefox Extended Support Release]] so that you don't get forcefully upgraded to the dreaded Quantum 57. GUI WAY...# Open Software Manager# In the search box type "Firefox" and click "remove"# Close Software Manager# Launch Software Sources (Menu button - Administration - Software Sources)# Choose PPAs and +Add a new PPA# enter: ppa:mozillateam/ppa# Click "update the cache" and close Software Sources# Open Software Manager# In the search box type "Firefox-esr" and when located "install"CLI WAY...See also: [[Firefox]] , [[Favorite Firefox Extensions]]</small>