diff --git a/config files/apt/etc/apt/preferences.d/debian-release-pinning b/config files/apt/etc/apt/preferences.d/debian-release-pinning
new file mode 100644
index 0000000..a6f8aa0
--- /dev/null
+++ b/config files/apt/etc/apt/preferences.d/debian-release-pinning	
@@ -0,0 +1,11 @@
+Package: *
+Pin: release a=stable
+Pin-Priority: 900
+
+Package: *
+Pin: release a=testing
+Pin-Priority: 990
+
+Package: *
+Pin: release a=unstable
+Pin-Priority: 499
diff --git a/config files/apt/etc/apt/preferences.d/firefox-pinning b/config files/apt/etc/apt/preferences.d/firefox-pinning
new file mode 100644
index 0000000..5d7c977
--- /dev/null
+++ b/config files/apt/etc/apt/preferences.d/firefox-pinning	
@@ -0,0 +1,3 @@
+Package: firefox
+Pin: release a=unstable
+Pin-Priority: 990
diff --git a/config files/apt/etc/apt/sources.list.d/debian-bullseye.list b/config files/apt/etc/apt/sources.list.d/debian-bullseye.list
new file mode 100644
index 0000000..620a233
--- /dev/null
+++ b/config files/apt/etc/apt/sources.list.d/debian-bullseye.list	
@@ -0,0 +1,8 @@
+deb http://deb.debian.org/debian/ bullseye main non-free contrib
+deb http://security.debian.org/debian-security bullseye-security main contrib non-free
+
+# bullseye-updates, previously known as 'volatile'
+deb http://deb.debian.org/debian/ bullseye-updates main contrib non-free
+
+# bullseye-backports, previously on backports.debian.org
+deb http://deb.debian.org/debian/ bullseye-backports main contrib non-free
diff --git a/config files/apt/etc/apt/sources.list.d/debian-buster.list b/config files/apt/etc/apt/sources.list.d/debian-buster.list
new file mode 100644
index 0000000..0fc50f7
--- /dev/null
+++ b/config files/apt/etc/apt/sources.list.d/debian-buster.list	
@@ -0,0 +1,7 @@
+deb http://deb.debian.org/debian/ buster main non-free contrib
+
+# buster-updates, previously known as 'volatile'
+deb http://deb.debian.org/debian/ buster-updates main contrib non-free
+
+# buster-backports, previously on backports.debian.org
+deb http://deb.debian.org/debian/ buster-backports main contrib non-free
diff --git a/config files/apt/etc/apt/sources.list.d/debian-stable.list b/config files/apt/etc/apt/sources.list.d/debian-stable.list
new file mode 100644
index 0000000..bc55b1b
--- /dev/null
+++ b/config files/apt/etc/apt/sources.list.d/debian-stable.list	
@@ -0,0 +1,4 @@
+deb http://deb.debian.org/debian/ stable main non-free contrib
+
+# stable-updates, previously known as 'volatile'
+deb http://deb.debian.org/debian/ stable-updates main contrib non-free
diff --git a/config files/apt/etc/apt/sources.list.d/debian-testing.list b/config files/apt/etc/apt/sources.list.d/debian-testing.list
new file mode 100644
index 0000000..8c55ed0
--- /dev/null
+++ b/config files/apt/etc/apt/sources.list.d/debian-testing.list	
@@ -0,0 +1,5 @@
+deb http://deb.debian.org/debian/ testing main non-free contrib
+deb http://security.debian.org/debian-security testing-security main contrib non-free
+
+# testing-updates, previously known as 'volatile'
+deb http://deb.debian.org/debian/ testing-updates main contrib non-free
diff --git a/config files/apt/etc/apt/sources.list.d/debian-unstable.list b/config files/apt/etc/apt/sources.list.d/debian-unstable.list
new file mode 100644
index 0000000..e6c36eb
--- /dev/null
+++ b/config files/apt/etc/apt/sources.list.d/debian-unstable.list	
@@ -0,0 +1 @@
+deb http://deb.debian.org/debian/ unstable main non-free contrib
diff --git a/config files/apt/etc/apt/sources.list.d/dropbox.list b/config files/apt/etc/apt/sources.list.d/dropbox.list
new file mode 100644
index 0000000..dc6a6d9
--- /dev/null
+++ b/config files/apt/etc/apt/sources.list.d/dropbox.list	
@@ -0,0 +1 @@
+deb [arch=i386,amd64] http://linux.dropbox.com/debian sid main