I wish they had some better UX designers. Hit the download button and I get a .bz2 file with no install scripts whatsoever.
$ tar jxvf firefox-57.0.tar.bz2
$ cd firefox
$ mkdir /usr/local/firefox
mkdir: cannot create directory '/usr/local/firefox': Permission denied
$ sudo su
Password:
# mkdir /usr/local/firefox
# cp -rv * /usr/local/firefox/
...
# ln -s /usr/local/firefox/firefox /usr/bin/firefox
ln: failed to create symbolic link '/usr/bin/firefox': File exists
# mv /usr/bin/firefox /usr/bin/firefox.bac
# ln -s /usr/local/firefox/firefox /usr/bin/firefox
Why couldn't they go the extra mile and give me a .deb file I can just click and install or dpkg -i, like Chrome does? Make it absolutely frictionless -- lubricate the whole process -- if you want people to use it instead of Chrome.