Installing the latest version of Firefox and Debian 13. Following the instructions in the Mozilla Support document Install Firefox on Linux https://support.mozilla.org/en-US/kb/install-firefox-linux Operating as Super User. Chose the option Install Firefox .deb package for Debian-based distributions (recommended) Steps 1, 2, and 3 worked exactly as expected with in a terminal and using bash. Step 4 and 5, following the For Debian Trixie and Newer choice does not work. A lot of digging on the internet and found that the command beginning with cat <<EOF needs to be cat <<’EOF’. The second part of this process has the same issue. Appling the new information solved the problem both statements now work. At this point you have a directory /etc/apt/keyrings. In this directory you have the file packages.mozilla.org.asc Step 3 returns success. You have also successfully applied steps 4 and 5. In directory /etc/apr/souces.list.d you have the file mozilla.sources. It contains the instruction “Signed-By: /usr/share/keyrings/packages.mozilla.org.gpg” No where in the previous stepd was the file Signed-By: packages.mozilla.org.gpg ever created. Why is the deb package looking in /usr/share/keyrings when step 2 puts a similarly named file Signed-By: /usr/share/keyrings/packages.mozilla.org.asc in /etc/apt/keyrings Step 6 Running apt update returns Err:4 https://packages.mozilla.org/apt mozilla InRelease  Sub-process /usr/bin/sqv returned an error code (1), error message is: Error: Failed to parse keyr ing "/usr/share/keyrings/packages.mozilla.org.gpg"  Caused by:     0: Reading "/usr/share/keyrings/p ackages.mozilla.org.gpg": No such file or directory (os error 2)     1: No such file or directory (o s error 2) Warning: OpenPGP signature verification failed: https://packages.mozilla.org/apt mozilla InRelease: Sub-process /usr/bin/sqv returned an error code (1), error message is: Error: Failed to parse keyrin g "/usr/share/keyrings/packages.mozilla.org.gpg"  Caused by:     0: Reading "/usr/share/keyrings/pac kages.mozilla.org.gpg": No such file or directory (os error 2)     1: No such file or directory (os error 2) Error: The repository 'https://packages.mozilla.org/apt mozilla InRelease' is not signed. Help This is a follow up of previous posts. Note to Wxie & Denys