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This question already has an answer here:

I have downloaded "firefox-29.0.tar.bz2" to update my firefox. How do I use this file to update firefox?

marked as duplicate by dessert, Videonauth, George Udosen, David Foerster, Charles Green Nov 16 '17 at 3:27

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    "how to use this to update firefox ?" you do not. This does not update; It will overwrite your current firefox. – Rinzwind May 1 '14 at 12:16
  • And besides using a tar why not the debian installer? saves you a lot of trouble... – Rinzwind May 1 '14 at 12:26
  • @DavidFoerster Agreed. that's a better dupe choice for this. VTR. – Elder Geek Nov 15 '17 at 15:27
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You don't need to do anything to update Firefox to Firefox 29. Firefox 29 is already available from your normal software updates. Just open the Software Updater and you will be asked if you want to get the update.

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First, extract the package,

tar -xjf firefox-29.0.tar.bz2

Then replace the older firefox,

sudo rm -rf /opt/firefox     (remove the folder, might be named differently)
sudo mv firefox /opt/firefox (mv to where old folder was)

Then fix the symbolic links,

sudo ln -s /opt/firefox/firefox /usr/bin/firefox

The easiest way, though, is just

sudo apt-get update
sudo apt-get upgrade

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