Download your installation files
When your download as finished
extract your files
$ mkdir /opt/firefoxde
$ tar -xjvf ~/Downloads/firefox-[version].[lang].[platform].tar.bz2
$ mv ~/Downloads/firefox/* /opt/firefoxde
Add the launcher to your menu
$ cd ~/.local/share/applications
create a new file named firefoxde.desktop and paste this metadata
[Desktop Entry]
Type=Application
Encoding=UTF-8
Name=Firefox DE
GenericName=Firefox Developer Edition
X-GNOME-FullName=Firefox Developer Edition
Comment=Browse the World Wide Web
Icon=/opt/firefoxde/browser/icons/mozicon128.png
Exec=/opt/firefoxde/firefox %u
Terminal=false
Categories=Network;WebBrowser;
Actions=Default;Mozilla;ProfileManager;
X-MultipleArgs=false
MimeType=text/html;text/xml;application/xhtml+xml;application/xml;application/vnd.mozilla.xul+xml;application/rss+xml;application/r$
StartupWMClass=Firefox-de
StartupNotify=true
[Desktop Action Default]
Name=Default Profile
Exec=/opt/firefoxde/firefox --no-remote -P minefield-default
[Desktop Action Mozilla]
Name=Mozilla Profile
Exec=/opt/firefoxde/firefox --no-remote -P minefield-mozilla
[Desktop Action ProfileManager]
Name=Profile Manager
Exec=/opt/firefoxde/firefox --no-remote --profile-manager
Save your file and run
$ desktop-file-install firefoxde.desktop