-
Open Terminal
Ctrl+Alt+TDownload Firefox Developer Editiontar filewget https://download.mozilla.org/?product=firefox-aurora-latest-ssl&os=linux64&lang=en-US -
Copy tar file to
optsudo cp -rp firefox-35.0a2.en-US.linux-x86_64.tar.bz2 -
Open
optfolder (cd /opt/) and untar filesudo tar xjf firefox-35.0a2.en-US.linux-x86_64.tar.bz2