Home built. PC Ubuntu 22.04.1 LTS Since we have update our OS from Ubuntu 20.04 LTS to Ubuntu 22.04 LTS (a few days ago) Firefox has only shown a Blank screen at first start up, only the very top line is visible showing "Activities" then "Firefox Web Browser". Nothing will work, the only thing that does is Quit. Restarting Firefox the second time seems to work Okay. Please can you advise me? More info: richard@charged-particle:~$ firefox -P Gtk-Message: 10:11:53.892: Failed to load module "canberra-gtk-module" Gtk-Message: 10:11:53.894: Failed to load module "canberra-gtk-module" ATTENTION: default value of option mesa_glthread overridden by environment. ATTENTION: default value of option mesa_glthread overridden by environment. ATTENTION: default value of option mesa_glthread overridden by environment. Gtk-Message: 10:12:06.820: Failed to load module "canberra-gtk-module" Gtk-Message: 10:12:06.822: Failed to load module "canberra-gtk-module" ATTENTION: default value of option mesa_glthread overridden by environment. ATTENTION: default value of option mesa_glthread overridden by environment. ATTENTION: default value of option mesa_glthread overridden by environment. Missing chrome or resource URL: resource://gre/modules/UpdateListener.jsm Missing chrome or resource URL: resource://gre/modules/UpdateListener.sys.mjs