Linux Capable published a tutorial showing you how to install Pale Moon Browser on Debian 11 Bullseye.
How to Install Pale Moon Browser on Debian 11 Bullseye
Learn how to install Pale Moon on Debian 11 Bullseye using the command line terminal and importing an officially Pale Moon endorsed APT repository.
How to Install Pale Moon Browser on Debian 11 Bullseye - LinuxCapable