feat(gnome): Add automatic updates for Firefox GNOME theme and Thunderbird GNOME theme (If installed)

README.md

@@ -115,6 +115,7 @@ Builds with the GNOME desktop environment are available in both desktop and deck
 - Features optional Valve-inspired themes matching Vapor and VGUI2 from SteamOS.
 - [Hanabi extension](https://github.com/jeffshee/gnome-ext-hanabi) included to offer similar features to Wallpaper Engine in KDE.
 - Numerous optional extensions pre-installed, including [important user experience fixes](https://www.youtube.com/watch?v=nbCg9_YgKgM).
+- Automatic updates for the [Firefox GNOME theme](https://github.com/rafaelmardojai/firefox-gnome-theme) and [Thunderbird GNOME theme](https://github.com/rafaelmardojai/thunderbird-gnome-theme). <sup><sub>(If installed)</sub></sup>
 
 > [!IMPORTANT]  
 > **ISOs can be downloaded from our releases page [here](https://github.com/ublue-os/bazzite/releases), and a helpful install guide can be found [here](https://universal-blue.org/images/bazzite/installation/).**

system_files/desktop/silverblue/etc/update.d/90-mozilla-gnome-themes.sh

@@ -0,0 +1,18 @@
+#!/usr/bin/bash
+shopt -s nullglob
+
+# Flatpak Firefox
+for firefox_gnome_theme in "$HOME/.var/app/org.mozilla.firefox/.mozilla/firefox/"*".default"*"/chrome/firefox-gnome-theme/"; do
+  if [ -d "$firefox_gnome_theme" ]; then
+    cd "$firefox_gnome_theme"
+    git pull origin master
+  fi
+done
+
+# Flatpak Thunderbird
+for thunderbird_gnome_theme in "$HOME/.var/app/org.mozilla.Thunderbird/.thunderbird/"*".default"*"/chrome/thunderbird-gnome-theme/"; do
+  if [ -d "$thunderbird_gnome_theme" ]; then
+    cd "$thunderbird_gnome_theme"
+    git pull origin master
+  fi
+done