copiar o firefox de https://www.mozilla.org/pt-PT/firefox/all/#product-desktop-release.
sudo mv Transferências/firefox-112.0.2.tar.bz2 /opt
cd /opt
sudo tar jxf firefox-112.0.2.tar.bz2
sudo chown -Rv kaos:kaos firefox
criar o ficheiro .desktop
sudo touch /usr/share/applications/firefox.desktop
e copiar o que se segue:
[Desktop Entry]
Name=Firefox Stable
Comment=Web Browser
Exec=/opt/firefox/firefox %u
Terminal=false
Type=Application
Icon=/opt/firefox/browser/chrome/icons/default/default128.png
Categories=Network;WebBrowser;
MimeType=text/html;text/xml;application/xhtml+xml;application/xml;application/vnd.mozilla.xul+xml;application/rss+xml;application/rdf+xml;image/gif;image/jpeg;image/png;x-scheme-handler/http;x-scheme-handler/https;
StartupNotify=true
Actions=Private;
[Desktop Action Private]
Exec=/opt/firefox/firefox --private-window %u
Name=Open in private mode