Setting up Firefox Developer Edition in Ubuntu

NOTE: I am now recommending to install Firefox via the .deb packages for Debian-based distributions The following instructions are from Support Mozilla with the settings v124 & Linux.

1. Create a directory to store APT repository keys if it doesn't exist:

   sudo install -d -m 0755 /etc/apt/keyrings

2. Import the Mozilla APT repository signing key:

   wget -q https://packages.mozilla.org/apt/repo-signing-key.gpg -O- | sudo tee /etc/apt/keyrings/packages.mozilla.org.asc > /dev/null

   If you do not have wget installed, you can install it with:

   sudo apt-get install wget

3. The fingerprint should be 35BAA0B33E9EB396F59CA838C0BA5CE6DC6315A3. You may check it with the following command:

   gpg -n -q --import --import-options import-show /etc/apt/keyrings/packages.mozilla.org.asc | awk '/pub/{getline; gsub(/^ +| +$/,""); if($0 == "35BAA0B33E9EB396F59CA838C0BA5CE6DC6315A3") print "\nThe key fingerprint matches ("$0").\n"; else print "\nVerification failed: the fingerprint ("$0") does not match the expected one.\n"}'

4. Next, add the Mozilla APT repository to your sources list:

   echo "deb [signed-by=/etc/apt/keyrings/packages.mozilla.org.asc] https://packages.mozilla.org/apt mozilla main" | sudo tee -a /etc/apt/sources.list.d/mozilla.list > /dev/null

5. Configure APT to prioritize packages from the Mozilla repository:

   echo '
   Package: *
   Pin: origin packages.mozilla.org
   Pin-Priority: 1000
   ' | sudo tee /etc/apt/preferences.d/mozilla

6. Update your package list and install the Firefox .deb package:
   • Firefox Developer Edition

     # Firefox Developer Edition
     sudo apt-get update && sudo apt-get install firefox-devedition

   • Firefox

     # Firefox
     sudo apt-get update && sudo apt-get install firefox

   • Firefox Beta

     # Firefox Beta (icon is the same as non beta version)
     sudo apt-get update && sudo apt-get install firefox-beta

   • Firefox Nightly

     # Firefox Nightly
     sudo apt-get update && sudo apt-get install firefox-nightly