EDIT: I WOULD ADVISE AGAINST INSTALLING THIS GLOBALLY IF YOU WANT AUTOMATIC UPDATES TO FUNCTION UNLESS YOU'RE ALWAYS LOGGED IN AS ROOT
1. Download the appropriate binary localized version / architecture
https://www.mozilla.org/en-US/firefox/developer/all/
2. Install globally, or in your local user account
2.1 Global Install
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sudo mkdir /opt/
sudo tar -xvjf firefox-41.0a2.en-US.linux-x86_64.tar.bz2 -C /opt/
sudo ln -s /opt/firefox/firefox /usr/local/bin/x-www-browser
sudo ln -s /opt/firefox/firefox /usr/local/bin/gnome-www-browser
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sudo nano -w /usr/share/applications/firefox-dev.desktop
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[Desktop Entry]
Encoding=UTF-8
Name=Firefox Developer Edition
Comment=Browse the World Wide Web
GenericName=Web Browser
X-GNOME-FullName=Firefox Web Browser
Exec=/opt/firefox/firefox %u
Terminal=false
X-MultipleArgs=false
Type=Application
Icon=/opt/firefox/browser/icons/mozicon128.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;
StartupWMClass=Firefox
StartupNotify=true
2.2 Local Install
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mkdir ~/opt/
tar -xvjf firefox-41.0a2.en-US.linux-x86_64.tar.bz2 -C ~/opt/
ln -s ~/opt/firefox/firefox ~/bin/x-www-browser
ln -s ~/opt/firefox/firefox ~/bin/gnome-www-browser
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nano -w ~/.local/share/applications/applications/firefox-dev.desktop
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[Desktop Entry]
Encoding=UTF-8
Name=Firefox Developer Edition
Comment=Browse the World Wide Web
GenericName=Web Browser
X-GNOME-FullName=Firefox Web Browser
Exec=~/opt/firefox/firefox %u
Terminal=false
X-MultipleArgs=false
Type=Application
Icon=~/opt/firefox/browser/icons/mozicon128.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;
StartupWMClass=Firefox
StartupNotify=true
Everything below is optional
4. Install uBlock
https://addons.mozilla.org/en-US/firefox/addon/ublock/
5. Install icedtea (Java)
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sudo apt-get install -y icedtea-plugin
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sudo apt-get install -y flashplugin-nonfree