Thunderbird

https://www.mozilla.org/en-US/thunderbird/

Binary code distribution:

• thunderbird-PORTABLE
  • extract PORTABLE software packages with command tar (not installpkg):
    
    tar xfv thunderbird*vd.tar.xz
  • contains the following extensions (enable them by entering into the Web browser's address bar about:addons):
    • Enigmail for Linux

References

Working with encrypted e-mail
https://support.mozilla.org/en-US/kb/what-happened-to-the-file-edit-and-view-menus
https://ssd.eff.org/tech/browsers
https://ftp.mozilla.org/pub/mozilla.org/firefox/candidates/
https://download-installer.cdn.mozilla.net/pub/firefox/releases/
"Browser Fingerprinting: 9 Facts", M. Schwartz, 2013
https://www.mozilla.org/en-US/firefox/notes/
https://www.mozilla.org/en-US/firefox/beta/notes/
http://www.t2-project.org/packages/firefox.html
http://bkhome.org/blog/?viewDetailed=02118
https://wiki.mozilla.org/Fingerprinting
https://bitbucket.org/adstomper/adblockedge
https://addons.mozilla.org/en-US/firefox/addon/adblock-plus/