How to install old Mozilla Firefox on Ubuntu 19.04,18.04,16.04,12.04, Linux mint,suse Linux

How to install old version of Firefox on Ubuntu18.04,19.04,16.04,17.04,15.04,14.04,12.04,Linux mint,suse,kubuntu,kubuntu elementary OS.
How to downgrade Firefox to older version of Ubuntu
#firefox #mozilla #oldfirefox
Command used: –
First download the old version of Firefox from the following URL

http://ftp.mozilla.org/pub/firefox/releases/
choose the version you want to install
sudo mv firefox /opt
sudo apt-get install alacarte

Note:- Disable automatic update after installing Firefox

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