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