By the way this is quick solution for people who want to painlessly upgrade unsupported Firefox ESR in Bullseye, folks on Debian User mailing list came up with this, I updated it a bit:
How to download & maintain new Firefox ESR from Mozilla, point always to latest Firefox-ESR: wget -O firefox.tar.bz2 "https://download.mozilla.org/?product=firefox-esr-latest&os=linux64&lang=en-GB"; tar vxf firefox.tar.bz2 Binary is in ~/firefox/firefox. You can replace Firefox shortcut you use, or add a new one. Remember to backup ~/.mozilla first, as upgrading Firefox will most likely make using profile again under Firefox ESR 78 impossible. Once Firefox ESR is updated in Stable, you can stop using it and continue with normal Debian package. -- With kindest regards, Piotr. ⢀⣴⠾⠻⢶⣦⠀ ⣾⠁⢠⠒⠀⣿⡁ Debian - The universal operating system ⢿⡄⠘⠷⠚⠋⠀ https://www.debian.org/ ⠈⠳⣄⠀⠀⠀⠀
