[feat] import firefox Dockerfile from jessfraz

The Docker images on her Docker hub are not updated for 5 months now.
https://hub.docker.com/r/jess/firefox/tags

firefox/Dockerfile

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+# This file is originally by Jessie Frazelle and is licensed under the MIT
+# license.
+#
+# https://github.com/jessfraz/dockerfiles/blob/b11b7d2fb3df244af9b765e862db36a5cd9a4c63/firefox/Dockerfile
+
+FROM debian:sid-slim
+LABEL maintainer "Jessie Frazelle <[email protected]>"
+
+RUN apt-get update && apt-get install -y \
+	dirmngr \
+	gnupg \
+	--no-install-recommends \
+	&& apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 0AB215679C571D1C8325275B9BDB3D89CE49EC21 \
+	&& echo "deb http://ppa.launchpad.net/mozillateam/firefox-next/ubuntu xenial main" >> /etc/apt/sources.list.d/firefox.list \
+	&& apt-get update && apt-get install -y \
+	apulse \
+	ca-certificates \
+	ffmpeg \
+	firefox \
+	hicolor-icon-theme \
+	libasound2 \
+	libgl1-mesa-dri \
+	libgl1-mesa-glx \
+	libpulse0 \
+	fonts-noto \
+	fonts-noto-cjk \
+	fonts-noto-color-emoji \
+	--no-install-recommends \
+	&& rm -rf /var/lib/apt/lists/*
+
+ENV LANG en-US
+
+COPY local.conf /etc/fonts/local.conf
+
+RUN echo 'pref("browser.tabs.remote.autostart", false);' >> /etc/firefox/syspref.js
+
+COPY entrypoint.sh /usr/bin/startfirefox
+
+ENTRYPOINT [ "startfirefox" ]

firefox/entrypoint.sh

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+#!/bin/bash
+
+# This file is originally by Jessie Frazelle and is licensed under the MIT
+# license.
+
+if [[ -e /dev/snd ]]; then
+	exec apulse firefox "$@"
+else
+	exec firefox "$@"
+fi

firefox/local.conf

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+<?xml version='1.0'?>
+<!-- This file is originally by Jessie Frazelle and is licensed under the MIT license. -->
+<!DOCTYPE fontconfig SYSTEM 'fonts.dtd'>
+<fontconfig>
+<match target="font">
+<edit mode="assign" name="rgba">
+<const>rgb</const>
+</edit>
+</match>
+<match target="font">
+<edit mode="assign" name="hinting">
+<bool>true</bool>
+</edit>
+</match>
+<match target="font">
+<edit mode="assign" name="hintstyle">
+<const>hintslight</const>
+</edit>
+</match>
+<match target="font">
+<edit mode="assign" name="antialias">
+<bool>true</bool>
+</edit>
+</match>
+<match target="font">
+<edit mode="assign" name="lcdfilter">
+<const>lcddefault</const>
+</edit>
+</match>
+<match target="font">
+<edit name="embeddedbitmap" mode="assign">
+<bool>false</bool>
+</edit>
+</match>
+</fontconfig>