firefox

#!/usr/bin/env bash

set -eu
shopt -s nullglob

export FONTCONFIG_FILE=~/.config/fontconfig/browser.conf
export MOZ_USE_XINPUT2=1

[[ -x /usr/bin/firefox.real ]] && firefox_bin=/usr/bin/firefox.real || firefox_bin=/usr/bin/firefox

# Firefox disallows sideloading extensions from ~/.mozilla/extensions but
# there's an exception allowing sideloading them from system directories as
# these would normally be inaccessible to users. As a workaround, use bwrap to
# bind-mount the user-specific extensions into the system directory.
#
# Note that Debian patches the extensions.autoDisableScopes pref, other
# distributions of Firefox may disable the system dirs as well, but this is
# easily overridden in about:config.
function sideload-workaround {
	local firefox_app_id="{ec8030f7-c20a-464f-9b0e-13a3a9e97384}"
	local user_extension_dir=~/.mozilla/extensions/"$firefox_app_id"
	local sys_extension_dir=/usr/share/mozilla/extensions/"$firefox_app_id"

	local bwrap_extension_binds=()
	local ext
	for ext in "$user_extension_dir"/*; do
		bwrap_extension_binds+=(--bind "$(readlink -f "$ext")" "$sys_extension_dir"/"${ext#"$user_extension_dir"/}")
	done
	for ext in "$sys_extension_dir"/*; do
		bwrap_extension_binds+=(--bind "$(readlink -f "$ext")" "$ext")
	done

	local bwrap=(
		bwrap
			--bind /{,}
			--dev-bind /dev{,}
			--tmpfs "$sys_extension_dir"
			"${bwrap_extension_binds[@]}"
			--
		${LD_LIBRARY_PATH+/usr/bin/env LD_LIBRARY_PATH="$LD_LIBRARY_PATH"}
	)

	exec "${bwrap[@]}" "$@"
}

sideload-workaround "$firefox_bin" "$@"