Installation of Firefox Linux direct from Mozilla repository failes

<i>duplicate of [/questions/1495342] thread</i> I try to install Firefox directly from the Mozilla repository. For that, I read the article "Install Firefox on Linux" and followed the install instructions in first chapter "Debian-based distributions" step-by-step. (article https://support.mozilla.org/en-US/kb/install-firefox-linux) Unfortunately, with every attempt to install Firefox, the Firefox LinuxMint (Ubundu) package will be still installed. The command to priorise the Mozilla repository seems to have no influenace. How can I prevent/avoid using the LinuxMint/Ubundu repository? I wan't to install and update Firefox direct from Mozilla source. I'm using Linux Mint 22.1 Xia base (Ubuntu 24.04 noble)