Step-by-step – Firefox Developer Installation in Fedora 34

Installing

2. 2. Downloading Firefox Developer

   Download Firefox Developer Edition for Linux

   Firefox Developer i686/x64 tar.bz2

   Firefox Developer Linux

3. 3. Extracting Firefox Developer

   Then Extract into /tmp
   Possibly Double-Click/Right-Click and Open with Archive Manager:

   

4. 4. Installing Firefox Developer

   Then to Install Firefox Developer
   First, Set the SuperUser as Owner:

   sudo chown -R root:root /tmp/firefox

   Authenticate with the User Admin Pass.
   If Got “User is Not in Sudoers file” then see: How to Enable sudo
   Then Relocate firefox Into firefox-dev:

   sudo mv /tmp/firefox /opt/firefox-dev

   And finally, Make a Symlink for Easy-Launching:

   sudo ln -s /opt/firefox-dev/firefox /usr/local/bin/firefox-dev