First update your environmentOpen a terminal and type the following:sudo apt update; sudo apt upgrade; sudo apt autoremove Then Download Firestorm from their web site. https://www.firestormviewer.org/choose-your-platform/ Pick the Penguin, and the 64 bit download. Extract the file by either tar -xvf Phoenix-Firestorm-Releasex64-6-6-8-68380.tar.xz or with the file viewer using Archive Manager. Now install. I use /opt/fire… Continue reading Firestorm Viewer install for linux Mint 21.1