Basic shell script to install && update Firefox Developer Edition on Linux (specifically Ubuntu)

firefox-dev-edition-update

#!/bin/bash
set -e

# Installation of this script:
#   Delete one of the url variables below, or get another from
#   https://www.mozilla.org/firefox/all/#product-desktop-developer
#   by selecting your language and platform, then copying the link on the
#   Download button.
#   
url='https://download.mozilla.org/?product=firefox-devedition-latest-ssl&os=linux64&lang=en-US'
url='https://download.mozilla.org/?product=firefox-devedition-latest-ssl&os=linux64&lang=en-GB'
#
#   Then run:
#     sudo install firefox-dev-edition-update /usr/local/sbin/
#
# Desktop integration:
#   Save the accompanying .desktop file or adapt from
#   /usr/share/applications/firefox.desktop
#   into
#   /usr/share/applications/firefoxDevEdition.desktop
#   or ~/.local/share/applications/firefoxDevEdition.desktop
#
#   Save/merge the policies.json file into
#   /etc/firefox/policies/policies.json
#   to prevent Firefox from trying to update itself.
#
#   Change your default browser application.


dir=/opt
subdir=firefox-dev-edition
bin="$dir/$subdir/firefox"
arcglob='firefox-*.tar.*'
arcre='\S+?(?=\.tar\.)'
notifylabel='Firefox dev edn. update check'

help=0
delete=0
check=0
graphical=0
install=0
existing=0
while getopts ':hcgdie' opt; do
	case $opt in
		h)
			help=1
			;;
		c)
			check=1
			;;
		g)
			graphical=1
			;;
		d)
			delete=1
			;;
		i)
			install=1
			;;
		e)
			existing=1
			;;
		\?)
			>&2 echo "Unknown option $OPTARG."
			help=1
			;;
	esac
done
if ! (( help + delete + check + install )); then
	help=1
fi

if (( help )); then
	>&2 cat <<-EOT
		${0##*/} [ -h | -c [ -g ] | -i [ -d ] [ -e ] | -d [ -e ] ]

		Options:
		  -h  This help.
		  -c  Check for an updated version.
		  -g  Make check graphical (requires notify-send).
		  -i  Download and update/install, overwriting any previous install.
		  -d  Delete existing backup & archive files from previous attempts.
		      If combined with -ie, leaves the installation archive intact.
		  -e  Install/keep an existing downloaded archive.
		EOT
	exit
fi

if (( check )); then
	vremote=$(wget --max-redirect=0 --method=HEAD --server-response "$url" 2>&1 > /dev/null | \
		grep -Pio '^\s+Location:.*/\D+\K'"$arcre" || true)
	err=0
	if [[ -z "$vremote" ]]; then
		msg='Could not check remote version.'
		err=1
	else
		if [[ -f "$bin" ]]; then
			vlocal=$("$bin" -v | grep -Po '^\D*\K\S+' || true)
			if [[ -z "$vlocal" ]]; then
				msg='Could not check local version.'
				err=1
			elif [[ "$vlocal" == "$vremote" ]]; then
				if ! (( graphical )); then
					>&2 echo Up to date.
				fi
				exit
			else
				msg="Installed: $vlocal"
			fi
		else
			msg='Not installed locally.'
		fi
		msg="Remote: $vremote"$'\n'"$msg"
	fi
	if (( graphical )); then
		notify-send --icon=update-medium -u critical -t 0 "$notifylabel" "$msg"
	else
		>&2 cat <<<"$msg"
		if (( err )); then
			exit 1
		fi
	fi
	exit
fi

cd "$dir"

function readarcs {
	arcs=()
	readarray -t arcs < <(compgen -G "$arcglob" | sort -rV)
}

readarcs
if (( delete )); then
	>&2 echo -n 'Cleaning... '
	if [[ -d "$subdir~/" ]] && ! rm -r "$subdir~/"; then
		>&2 echo "Could not remove backup dir $dir/$subdir~/"
		exit 1
	fi
	keep=0
	if (( existing )); then
		if [[ "${#arcs[@]}" -le 1 ]]; then
			keep=1
		else
			n=0
			for arc in "${arcs[@]}"; do
				n=$(( n + 1 ))
				>&2 echo "$n: $arc "`stat -c'%s' "$arc"`b
			done
			while ! (( keep )); do
				read -r -p 'Select archive to keep for installation: ' keep
				if ! [[ "$keep" =~ ^[1-9][0-9]*$ ]] || (( keep > n )); then
					>&2 echo Invalid selection. Ctrl + C to terminate.
					keep=0
				fi
			done
		fi
	fi
	n=0
	for arc in "${arcs[@]}"; do
		n=$(( n + 1 ))
		if [[ $keep -ne $n ]] && ! rm "$arc"; then
			>&2 echo "Could not remove archive $dir/$arc"
			exit 1
		fi
	done
elif (( install )); then
	if [[ -d "$subdir~/" ]] || [[ "${#arcs[@]}" -ge 2 ]] || { ! (( existing )) && [[ "${#arcs[@]}" -gt 0 ]]; }; then
		>&2 echo Delete files from previous install by adding the -d option.
		exit 1;
	fi
fi

if (( install )); then
	if ! (( existing )); then
		>&2 echo -n 'Downloading... '
		if ! wget -q --trust-server-names "$url"; then
			>&2 echo Failed.
			exit 1;
		fi
	fi
	readarcs
	if [[ "${#arcs[@]}" -ne 1 ]]; then
		>&2 echo No recognised installation archive.
		exit 1;
	fi
	arc="${arcs[0]}"
	>&2 echo -n 'Installing... '
	if { ! [[ -d "$subdir/" ]] || mv "$subdir/" "$subdir~/" ; } && \
		tar --no-same-owner -xf "$arc" --transform='s,^[^/]\+,'"$subdir,"
	then
		>&2 echo Done.
	else
		>&2 echo Failed.
		exit 1;
	fi
elif (( delete )); then
	>&2 echo Done.
fi

firefoxDevEdition.desktop

[Desktop Entry]
Version=1.0
Name=Firefox Developer Edition
Comment=Browse the World Wide Web
GenericName=Web Browser
Keywords=Internet;WWW;Browser;Web;Explorer
Exec=/opt/firefox-dev-edition/firefox %u
Terminal=false
X-MultipleArgs=false
Type=Application
Icon=/opt/firefox-dev-edition/browser/chrome/icons/default/default128.png
Categories=GNOME;GTK;Network;WebBrowser;
MimeType=text/html;text/xml;application/xhtml+xml;application/xml;application/rss+xml;application/rdf+xml;image/gif;image/jpeg;image/png;x-scheme-handler/http;x-scheme-handler/https;x-scheme-handler/ftp;x-scheme-handler/chrome;video/webm;application/x-xpinstall;
StartupNotify=true
Actions=new-window;new-private-window;

[Desktop Action new-window]
Name=Open a New Window
Exec=/opt/firefox-dev-edition/firefox -new-window

[Desktop Action new-private-window]
Name=Open a New Private Window
Exec=/opt/firefox-dev-edition/firefox -private-window

policies.json

{
	"policies": {
		"DisableAppUpdate": true
	}
}

Quick start (nano is to choose/set URL):

wget https://gist.githubusercontent.com/Roy-Orbison/2a2bc5270a30c737e42b2379b1aec01c/raw/fb6d736252485e1dcc86a935ca269a04ea1b42a7/firefox-dev-edition-update
nano firefox-dev-edition-update
sudo install firefox-dev-edition-update /usr/local/sbin/
sudo firefox-dev-edition-update -i
sudo wget -P /usr/share/applications/ https://gist.githubusercontent.com/Roy-Orbison/2a2bc5270a30c737e42b2379b1aec01c/raw/fb6d736252485e1dcc86a935ca269a04ea1b42a7/firefoxDevEdition.desktop
sudo mkdir -p /etc/firefox/policies
sudo wget -P /etc/firefox/policies/ https://gist.githubusercontent.com/Roy-Orbison/2a2bc5270a30c737e42b2379b1aec01c/raw/fb6d736252485e1dcc86a935ca269a04ea1b42a7/policies.json