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You can install FireFox in a number of ways. The simplest process is to use the Ubuntu Software Center.

Open Ubuntu Software Center and do a search on Firefox:

Click on Firefox and follow the prompts to install the Firefox.

To install Firefox via terminal. Open terminal via menu or via keys CLT+ALT+T.

sudo apt install firefox

You can also install Firefox via PPA:

  1. First, we need to add the Mozilla signing key to our system:
$ sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys A6DCF7707EBC211F

Next, add Mozilla’s PPA repository and update the list of available packages in apt:

$ sudo apt-add-repository "deb http://ppa.launchpad.net/ubuntu-mozilla-security/ppa/ubuntu focal main" 
$ sudo apt update

Finally, if all went well up till now, install the latest version of Firefox with this command:

$ sudo apt install firefox
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