This is how I installed the Mozilla Firefox Developer Edition in my Fedora Linux 40 (Workstation Edition) machine.

Download the Mozilla Firefox Developer Edition’s latest binary, then extract it. Rename the extracted folder if you want to.

# extract
tar -xvjf firefox-131.0b8.tar.bz2

# rename
mv firefox firefox-dev

Move the extracted folder to /opt directory. It will require sudo access level.

sudo mv firefox-dev /opt/

Create a firefox-dev.desktop file at ~/.local/share/applications/.

[Desktop Entry]
Name=Firefox Developer
GenericName=Firefox Developer Edition
Exec=/opt/firefox-dev/firefox %u
Terminal=false
Icon=/opt/firefox-dev/browser/chrome/icons/default/default128.png
Type=Application
Categories=Application;Network;X-Developer;
Comment=Firefox Developer Edition Web Browser.
StartupWMClass=firefox-aurora

Finally, reboot your machine.

reboot