There are many reasons why you may want to install Firefox on a Chromebook (could be for security, privacy or just as a technical challenge). You could install the Android app but that isn’t a full featured browser. Here are the instructions on how to install it in the Linux container.

Go to Settings 

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Search for Linux and Turn it On.

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You will get the installation window. Continue and let it complete.

Prepare Linux

You will then be presented with the terminal window, run an update then an upgrade.

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“sudo apt update” 
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“sudo apt upgrade”

Install Firefox on ChromeOS

Now we are ready to install Firefox.

Got to the terminal and enter sudo apt install firefox-esr

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Now you can start Firefox by entering the firefox-esr command to invoke the app.

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If you want to invoke Firefox-Esr but also need your terminal to work (at the same time), use the command firefox-esr &