Upgrading any pre-installed Ubuntu package such as firefox can easily be done via a GUI package manager called Synaptic.
If Synaptic is not installed yet, install it as follows.
Close all open Firefox windows.
Launch Synaptic via Ubuntu Dash as follows.
Search for firefox package on Synaptic.
Highlight firefox package, right-click it, and select "Mark for Upgrade" option.
It may pop up a window asking for upgrading additional packages. Make them as well.
Finally, click on "Apply" button on Synaptic to trigger upgrade.
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