In light of firefox becoming a snap, i have a tutorial on how to replace the snap version with the version from mozilla’s website.
Note: This involves getting through a little bit of terminal, but we’ll just be copying and pasting commands here. This also works with any Ubuntu flavour.
Precaution: I advice to remove the firefox snap before doing this. Only remove snapd if you don’t want it anymore.
- in a terminal, type in sudo snap remove firefox. Type in your password, then wait until the snap is removed.
Now, we can proceed to installing the tar version of firefox! 
-
Download the tar from the website.
-
Open a terminal and paste this command:
cd ~/Downloads -
Then extract the contents using this command:
tar xjf firefox-*.tar.bz2 -
Apply this command:
sudo mv firefox /opt.
You will be asked to enter your password. -
Apply this command to make sure firefox is executable:
sudo ln -s /opt/firefox/firefox /usr/local/bin/firefox -
And last but not least apply this command:
sudo wget https://raw.githubusercontent.com/mozilla/sumo-kb/main/install-firefox-linux/firefox.desktop -P /usr/local/share/applications -
And your done
