You can find a list of tools to work under Debian on the Software equivalents page.

• How to install and use Debian backports
• Debian on the Desktop
• DebianDesktopHowTo
• Unofficial non-free images including firmware packages
• Installing Debian On Dell XPS 13 9380
• Debian install on Stellar PC from Ekimia (2017)

ar x dpkg_1.17.23_amd64.deb
tar -zxf data.tar.gz
(or tar -xf data.tar.xz)

dpkg-reconfigure tzdata

cat > ~/.local/share/applications/Postman.desktop <<EOL
[Desktop Entry]
Type=Application
Name=Postman
Exec=/home/jdx/.local/bin/postman
Icon=/home/jdx/dev/progs/Postman/app/resources/app/assets/icon.png
Categories=Development;
Encoding=UTF-8
Terminal=false
EOL

Add this file to handle dark themes with Firefox :

cat ~/.mozilla/firefox/randomName.default/chrome/userContent.css
input:not(.tactile-searchbox-input):not(.urlbar-input):not(.textbox-input):not(.form-control):not([type='checkbox']) {
    -moz-appearance: none !important;
    background-color: white;
    color: black;
}

#downloads-indicator-counter {
    color: white;
}

textarea {
    -moz-appearance: none !important;
    background-color: white;
    color: black;
}

select {
    -moz-appearance: none !important;
    background-color: white;
    color: black;
}

Download the tar.gz archive from the official website, then :

tar -xzvf flash_player_npapi_linux.x86_64.tar.gz
sudo mv libflashplayer.so /usr/lib/mozilla/plugins

# rm -rf flash_player_npapi_linux.x86_64.tar.gz LGPL license.pdf readme.txt usr