diff --git a/.config/linux/system/flake.nix b/.config/linux/system/flake.nix
index 9e735f2..a215a28 100644
--- a/.config/linux/system/flake.nix
+++ b/.config/linux/system/flake.nix
@@ -20,6 +20,7 @@
 			./module/common/Distrobox.nix
 			./module/common/Dotfiles.nix
 			./module/common/Filesystem.nix
+			./module/common/Firefox.nix
 			./module/common/Firewall.nix
 			./module/common/Kernel.nix
 			./module/common/Locale.nix
diff --git a/.config/linux/system/module/Desktop.nix b/.config/linux/system/module/Desktop.nix
index 0a05730..fc1eb41 100644
--- a/.config/linux/system/module/Desktop.nix
+++ b/.config/linux/system/module/Desktop.nix
@@ -12,5 +12,7 @@
 		onlyoffice-bin
 		tor-browser
 	];
+
+	# Special packages.
 	programs.steam.enable = true;
 }
diff --git a/.config/linux/system/module/common/Firefox.nix b/.config/linux/system/module/common/Firefox.nix
new file mode 100644
index 0000000..47fb53a
--- /dev/null
+++ b/.config/linux/system/module/common/Firefox.nix
@@ -0,0 +1,81 @@
+{ pkgs, ... }: {
+	programs.firefox = {
+		enable = true;
+		languagePacks = [ "en-US" "ru" ];
+		autoConfig = ''
+			// Bookmarks.
+			lockPref("browser.bookmarks.file", "/home/voronind/.config/firefox/Bookmarks.html");
+			lockPref("browser.microsummary.enabled",       true);
+			lockPref("browser.places.importBookmarksHTML", true);
+
+			// Fonts.
+			lockPref("browser.display.use_document_fonts", 0);
+			lockPref("font.minimum-size.x-cyrillic", 12);
+			lockPref("font.minimum-size.x-unicode",  12);
+			lockPref("font.minimum-size.x-western",  12);
+			lockPref("font.name.monospace.x-cyrillic", "Terminess Nerd Font Mono");
+			lockPref("font.name.monospace.x-unicode",  "Terminess Nerd Font Mono");
+			lockPref("font.name.monospace.x-western",  "Terminess Nerd Font Mono");
+			lockPref("font.name.sans-serif.x-cyrillic", "SF Pro Text");
+			lockPref("font.name.sans-serif.x-unicode",  "SF Pro Text");
+			lockPref("font.name.sans-serif.x-western",  "SF Pro Text");
+			lockPref("font.name.serif.x-cyrillic", "SF Pro Text");
+			lockPref("font.name.serif.x-unicode",  "SF Pro Text");
+			lockPref("font.name.serif.x-western",  "SF Pro Text");
+
+			// Animations.
+			lockPref("browser.fullscreen.animateUp", 0);
+			lockPref("browser.fullscreen.autohide", true);
+
+			// Homepage.
+			lockPref("browser.newtabpage.enabled", false);
+			lockPref("browser.startup.homepage", "https://home.voronind.com/");
+			lockPref("browser.startup.page", 3);
+
+			// Passwords.
+			lockPref("signon.prefillForms",    false);
+			lockPref("signon.rememberSignons", false);
+		'';
+		policies = {
+			ExtensionUpdate = true;
+			ExtensionSettings = {
+				"*" = {
+					install_sources   = [ "*" ];
+					installation_mode = "blocked";
+				};
+				"queryamoid@kaply.com" = {
+					installation_mode = "force_installed";
+					install_url       = "https://github.com/mkaply/queryamoid/releases/download/v0.1/query_amo_addon_id-0.1-fx.xpi";
+				};
+				"{446900e4-71c2-419f-a6a7-df9c091e268b}" = {
+					installation_mode = "force_installed";
+					install_url       = "https://addons.mozilla.org/firefox/downloads/latest/bitwarden-password-manager/latest.xpi";
+				};
+				"cliget@zaidabdulla.com" = {
+					installation_mode = "force_installed";
+					install_url       = "https://addons.mozilla.org/firefox/downloads/latest/cliget/latest.xpi";
+				};
+				"addon@darkreader.org" = {
+					installation_mode = "force_installed";
+					install_url       = "https://addons.mozilla.org/firefox/downloads/latest/darkreader/latest.xpi";
+				};
+				"{e7625f06-e252-479d-ac7a-db68aeaff2cb}" = {
+					installation_mode = "force_installed";
+					install_url       = "https://addons.mozilla.org/firefox/downloads/latest/togglefonts/latest.xpi";
+				};
+				"uBlock0@raymondhill.net" = {
+					installation_mode = "force_installed";
+					install_url       = "https://addons.mozilla.org/firefox/downloads/latest/ublock-origin/latest.xpi";
+				};
+				"{d7742d87-e61d-4b78-b8a1-b469842139fa}" = {
+					installation_mode = "force_installed";
+					install_url       = "https://addons.mozilla.org/firefox/downloads/latest/vimium-ff/latest.xpi";
+				};
+				"{08d5243b-4236-4a27-984b-1ded22ce01c3}" = {
+					installation_mode = "force_installed";
+					install_url       = "https://addons.mozilla.org/firefox/downloads/latest/gruvboxgruvboxgruvboxgruvboxgr/latest.xpi";
+				};
+			};
+		};
+	};
+}
diff --git a/.config/linux/system/module/common/Package.nix b/.config/linux/system/module/common/Package.nix
index 0f31a60..e8191ff 100644
--- a/.config/linux/system/module/common/Package.nix
+++ b/.config/linux/system/module/common/Package.nix
@@ -1,6 +1,5 @@
 { pkgs, ... }: {
 	environment.systemPackages = with pkgs; [
-		android-tools
 		appimage-run
 		binwalk
 		btop
@@ -10,7 +9,6 @@
 		ddrescue
 		ffmpeg
 		file
-		firefox
 		gcc
 		git
 		gnome.gnome-tweaks
@@ -42,4 +40,7 @@
 		yt-dlp
 		zip unzip
 	];
+
+	# Special packages.
+	programs.adb.enable     = true;
 }