How to Install Firefox Nightly on Debian Bullseye

Installing

2. 2. Downloading Firefox Nightly

   Download Latest Firefox Nightly for Linux

   Firefox Nightly Linux tar.bz2

   Firefox Nightly Linux

3. 3. Extracting Firefox Nightly

   Then Extract Firefox Nightly archive
   Double-Click/Right-Click on File Manager:

   
   Decompress Into /tmp.

4. 4. Installing Firefox Nightly

   Now Relocate Firefox Nightly
   
   Login as SuperUser:

   su 

   If Got “User is Not in Sudoers file” then Look:
   Solution
   
   
   Make a Firefox Directory:

   mkdir /opt/firefox

   Move Firefox Into firefox-Nightly so to Prepare for a Possible Firefox Multi-Version Coexistence

   sudo chown -R root:root /tmp/firefox && mv /tmp/firefox /opt/firefox/firefox-nightly

   Make a Symlink for Easy-Starting:

   ln -s /opt/firefox/firefox-nightly/firefox /usr/local/bin/firefox-nightly

5. 5. Launching Firefox Nightly

   Finally, Launch & Enjoy Firefox Nightly on Debian :)
   From Shell:

   firefox-nightly

   Create Application Firefox Launcher for Quick Starting

   Guide to Create Debian Launcher

   Contains Instructions to Create a Launcher on Linux Desktops.