After a fresh installation of Ubuntu 22.04 Desktop, Firefox (99) does not load after clicking on the icon on the left menu bar. Cursor changes to the rotating circle then disappears after a few seconds. I have performed four installations on the same hardware with the same results.
Motherboard: Gigabyte GA-970A-UD3 CPU: AMD Phenom II 6 Core 1055T RAM: 16GB Windowing System: Wayland
In one computer I switched from the default Wayland to Xorg in order to make Firefox work. I think it was in a computer with nvidia graphics.
Edit the configuration file,
sudo nano /etc/gdm3/custom.conf
to uncomment [remove # from] the line containing
WaylandEnable=false
save the file (ctrl + x and after that y ('yes') or another key for non-English and finally Enter) and reboot.
Trying to run Ubuntu 22.04 on a computer that has an Nvidia graphics card and is using the built-in open source Nouveau graphics driver can cause Firefox to be unable to open, however you can still browse the web by installing Chromium web browser with sudo snap install chromium.
The AMD Phenom II CPU does not have integrated graphics, so it needs a separate graphics card which in turn requires a graphics driver if your graphics card is an NVIDIA model. If so, open the terminal and run the following commands to automatically install the proprietary Nvidia graphics driver packages which are suitable for your graphics card. These commands will also automatically switch your display server protocol from the default Wayland to X11/Xorg.
sudo apt update
sudo ubuntu-drivers install
sudo reboot
The install option of ubuntu-drivers installs drivers that are appropriate for automatic installation including their dependencies.
