add firefox instructions

arch.md

@@ -11,6 +11,7 @@
     - [AppImage Support](#appimage-support)
     - [Bluetooth](#bluetooth)
     - [Audio](#audio)
+    - [Firefox](#firefox)
     - [RDP Remote Desktop](#rdp-remote-desktop)
     - [Virtualization](#virtualization)
     - [CUPS Printing](#cups-printing)
@@ -201,6 +202,14 @@ Without pipewire-pulse the audio level/device will reset every reboot.
 
 1.  `sudo pacman -S pipewire-pulse` (remove conflicting packages)
 
+### Firefox
+
+You'll want firefox and gnome-browser-connector (for gnome extension management).
+
+```bash
+sudo pacman -S firefox gnome-browser-connector
+```
+
 ### RDP Remote Desktop
 
 1. `sudo pacman -S remmina freerdp`