diff --git a/README.md b/README.md
index 85e499e..20ab86f 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
 # Personal Linux Desktop Setup
 
-This repository contains an Ansible playbook to bootstrap workstations with my custom Hyprland-based desktop environment and commonly used applications. It's basically a dotfiles repository on steroids.
+This repository contains an Ansible playbook to bootstrap workstations with my custom Hyprland-based desktop environment and commonly used applications. It's similar to a dotfiles repository but with extended functionality.
 
 ## Desktop Environment Components
 
@@ -17,7 +17,7 @@ The desktop environment is primarily composed of the following components:
 - [WezTerm](https://wezfurlong.org/wezterm/index.html) (terminal emulator)
 - [Emote](https://flathub.org/apps/com.tomjwatson.Emote) (emoji picker)
 - Hyprhelpr (custom bash script for common tasks)
-- Additional background tools (PipeWire, polkit-kde-agent, gnome-keyring etc.)
+- Additional background tools (e.g., PipeWire, polkit-kde-agent)
 
 ## Customization
 
@@ -25,29 +25,28 @@ The playbook generates configuration files based on the host-specific variables
 
 To add a new host, include its hostname in the inventory and create a corresponding `host_vars` file. Refer to the existing configurations for examples.
 
-Even if the host-specific configuration is missing, the playbook will bring up a functional system using sensible defaults. This makes it possible to provision new systems without needing to know details like monitor descriptions for Hyprland in advance.
-
 ## Usage
 
-This playbook is intended to be run on Debian `unstable`, with only the `standard system utilities` option selected in `tasksel` during installation. Usage on other versions of Debian likely won't work, as Hyprland requires relatively recent versions of its dependencies to build.
+This playbook is designed to be run on Debian `testing/sid` with only the "default tools" option selected during installation.
 
 ### Steps to Set Up a New System
 
 Run the following commands to set up a fully configured system:
 
 ```bash
-# Install git and ansible
-sudo apt update && sudo apt install -y git ansible
+# Install git
+sudo apt update && sudo apt install -y git
 
 # Clone and prepare the repository
 git clone https://git.bluemedia.dev/Bluemedia/desktop-config.git
 cd desktop-config
+bash prerequisites.sh
 
 # Customize the applications you want to install
 nano main.yml
 
 # Run the playbook
-ansible-playbook -i inventory/ --ask-become-pass main.yml
+ansible-playbook --ask-become-pass -i inventory/ main.yml
 
 # Reboot after the playbook completes
 sudo reboot
@@ -60,7 +59,7 @@ To update an already installed system, use the following commands:
 ```bash
 cd desktop-config
 git pull
-ansible-playbook -i inventory/ --ask-become-pass main.yml
+ansible-playbook --ask-become-pass -i inventory/ main.yml
 
 # Reboot after the playbook completes
 sudo reboot
diff --git a/roles/desktop-environment/tasks/hyprland.yml b/roles/desktop-environment/tasks/hyprland.yml
index aff174c..ee1e2d4 100644
--- a/roles/desktop-environment/tasks/hyprland.yml
+++ b/roles/desktop-environment/tasks/hyprland.yml
@@ -1,3 +1,16 @@
+- name: Set apt default-release to "testing"
+  become: yes
+  copy:
+    src: "{{ role_path }}/files/20-tum.conf"
+    dest: "/etc/apt/apt.conf.d/20-tum.conf"
+
+- name: Add unstable repository
+  become: yes
+  ansible.builtin.apt_repository:
+    repo: "deb http://deb.debian.org/debian unstable main contrib non-free-firmware"
+    state: present
+    update_cache: true
+
 - name: Install build dependencies
   become: yes
   apt:
@@ -43,7 +56,7 @@
       - libxcb-composite0-dev
       - libxcb-res0-dev
       - xwayland
-      - libzip5
+      - libzip4t64
       - libre2-dev
       # xdg-desktop-portal-hyprland
       - qt6-wayland
diff --git a/roles/firefox/tasks/main.yml b/roles/firefox/tasks/main.yml
index 4efac7b..34e2d04 100644
--- a/roles/firefox/tasks/main.yml
+++ b/roles/firefox/tasks/main.yml
@@ -1,3 +1,15 @@
+- name: Add Mozilla repository
+  become: yes
+  deb822_repository:
+    name: mozilla
+    types: deb
+    uris: https://packages.mozilla.org/apt
+    suites: mozilla
+    components: main
+    signed_by: https://packages.mozilla.org/apt/repo-signing-key.gpg
+    state: present
+    enabled: yes
+
 - name: Install packages
   become: yes
   apt: